Add Adopters, Code of Conduct, Contributing, and Maintainers guides (#14)

Signed-off-by: Andrei Kvapil <kvapss@gmail.com>

ADOPTERS.md

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+# Adopters
+
+Below you can find a list of organizations and users who have agreed to
+tell the world that they are using Cozystack in a production environment.
+
+The goal of this list is to inspire others to do the same and to grow
+this open source community and project.
+
+Please add your organization to this list. It takes 5 minutes of your time,
+but it means a lot to us.
+
+## Updating this list
+
+To add your organization to this list, you can either:
+
+- [open a pull request](https://github.com/aenix-io/cozystack/pulls) to directly update this file, or
+- [edit this file](https://github.com/aenix-io/cozystack/blob/main/ADOPTERS.md) directly in GitHub
+
+Feel free to ask in the Slack chat if you any questions and/or require
+assistance with updating this list.
+
+## Cozystack Adopters
+
+This list is sorted in chronological order, based on the submission date.
+
+| Organization | Contact | Date | Description of Use |
+| ------------ | ------- | ---- | ------------------ |
+| [Ænix](https://aenix.io/) | @kvaps | 2024-02-14 | Ænix provides consulting services for cloud providers and uses Cozystack as the main tool for organizing managed services for them. |

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+Cozystack follows the [CNCF Code of Conduct](https://github.com/cncf/foundation/blob/master/code-of-conduct.md).

CONTRIBUTING.md

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+# Contributing to Cozystack
+
+Welcome! We are glad that you want to contribute to our Cozystack project! 💖
+
+As you get started, you are in the best position to give us feedbacks on areas of our project that we need help with, including:
+
+* Problems found while setting up the development environment
+* Gaps in our documentation
+* Bugs in our Github actions
+
+First, though, it is important that you read the [code of conduct](CODE_OF_CONDUCT.md).
+
+The guidelines below are a starting point. We don't want to limit your
+creativity, passion, and initiative. If you think there's a better way, please
+feel free to bring it up in a Github discussion, or open a pull request. We're
+certain there are always better ways to do things, we just need to start some
+constructive dialogue!
+
+## Ways to contribute
+
+We welcome many types of contributions including:
+
+* New features
+* Builds, CI/CD
+* Bug fixes
+* [Documentation](https://github.com/aenix-io/cozystack-website/tree/main)
+* Issue Triage
+* Answering questions on Slack or Github Discussions
+* Web design
+* Communications / Social Media / Blog Posts
+* Events participation
+* Release management
+
+## Ask for Help
+
+The best way to reach us with a question when contributing is to drop a line in
+our [Telegram channel](https://t.me/cozystack), or start a new Github discussion.
+
+## Raising Issues
+
+When raising issues, please specify the following:
+
+- A scenario where the issue occurred (with details on how to reproduce it)
+- Errors and log messages that are displayed by the involved software
+- Any other detail that might be useful

MAINTAINERS.md

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+# The Cozystack Maintainers
+
+| Maintainer | GitHub Username | Company |
+| ---------- | --------------- | ------- |
+| Andrei Kvapil | [@kvaps](https://github.com/kvaps) | Ænix |
+| George Gaál | [@gecube](https://github.com/gecube) | Ænix |
+| Eduard Generalov | [@egeneralov](https://github.com/egeneralov) | Ænix |