add contributing and code of conduct guides

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as contributors and maintainers pledge to make
+participation in our project and our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, gender identity and expression, level of experience, nationality, personal appearance,
+race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable behavior and are expected to take
+appropriate and fair corrective action in response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or reject comments, commits, code, wiki edits,
+issues, and other contributions that are not aligned to this Code of Conduct, or to ban temporarily or permanently any
+contributor for other behaviors that they deem inappropriate, threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces when an individual is representing the
+project or its community. Examples of representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an appointed representative at an online or
+offline event. Representation of a project may be further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by contacting the project team at
+`open-source@arthenica.com`. All complaints will be reviewed and investigated and will result in a response that is
+deemed necessary and appropriate to the circumstances. The project team is obligated to maintain confidentiality with
+regard to the reporter of an incident. Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good faith may face temporary or permanent repercussions as determined by other members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4, available at
+[https://contributor-covenant.org/version/1/4][version].
+
+[homepage]: https://contributor-covenant.org
+[version]: https://contributor-covenant.org/version/1/4/

CONTRIBUTING.md

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+# How to contribute
+
+Thanks for taking the time to contribute! :heart:
+
+The following is a set of guidelines for contributing to `FFmpegKit`!
+
+## Project Resources
+
+* [Wiki](https://github.com/arthenica/ffmpeg-kit/wiki) includes most detailed documentation we have
+* [FFmpegKit Feature Roadmap](https://github.com/orgs/arthenica/projects/1) shows our long term plans for the project
+* [How To Get Help](https://github.com/arthenica/ffmpeg-kit/issues/215) details what you need to do if you need help
+* [Discussions](https://github.com/arthenica/ffmpeg-kit/discussions) is where we expect you to ask questions
+* [Issues](https://github.com/arthenica/ffmpeg-kit/issues) is for bugs and issues
+
+## Reporting Bugs
+
+Bugs are tracked as [GitHub issues](https://github.com/arthenica/ffmpeg-kit/issues). We have a `Bug report` issue 
+template which includes all the fields we need to see to confirm a bug and work on it. Try to fill out all template
+fields, especially the logs field and steps to reproduce the bug. Reproducing a bug is crucial to be able to fix it.
+
+### FFmpeg Bugs
+
+`FFmpegKit` does not modify the original `FFmpeg` source code. Therefore, if an `FFmpeg` feature or component is not 
+working as expected, most probably that problem comes from `FFmpeg`. If you encounter those kind of errors, we expect 
+you to install the desktop version of `FFmpeg` and test that feature or component there. If it fails on desktop too 
+then it must be reported to [FFmpeg bug tracker](https://trac.ffmpeg.org/). If not, then it is an `FFmpegKit` bug. 
+Create an issue and state that this bug doesn't exist on the `desktop` version of the same `FFmpeg` version.
+
+## Feature Requests
+
+Before creating a feature request, please check our long term plan for the project, which is visible under the
+[FFmpegKit Feature Roadmap](https://github.com/orgs/arthenica/projects/1). Then create an issue and fill out the
+`Feature request` issue template and provide as many details as possible.
+
+### External Library Requests
+
+`FFmpeg` supports a long list of `external` libraries. In `FFmpegKit` we did our best to support most of them. 
+However, there are still many libraries that cannot be used within `FFmpegKit`.
+
+Unfortunately, cross compilation is a challenging process. Because of that, we don't take new external library 
+requests. Though, we are open to PRs. If someone wants to contribute we'll be happy to review their changes that
+enables another external library in `FFmpeg`. 
+
+## Pull Requests
+
+Although it is not mandatory, our suggestion is to first discuss the change you wish to make via an issue or a 
+discussion. `FFmpegKit` is a complex project. There are many things that must be considered when implementing a
+feature.
+
+`FFmpegKit` has a unified API, which means we provide the same functionality on all platforms. Therefore, we expect
+the same from the pull requests as well. A feature must be implemented for all platforms unless it is a platform specific
+feature.
+
+Ensure that your changes rely on official documented methods and test your changes using the test applications we have
+under the [ffmpeg-kit-test](https://github.com/arthenica/ffmpeg-kit-test) repository.
+
+`main` branch of `FFmpegKit` includes only the latest released source code. Therefore, please open your pull requests
+against the development branches (`development` for native platforms, `development-react-native` for
+`react-native`, `development-flutter` for `flutter`). 
+
+Note that PRs about styling and cosmetic changes will not be accepted.
+
+Thanks!