add CONTRIBUTING file

Author: o2sh

CONTRIBUTING.md

@@ -0,0 +1,59 @@
+# Contributing Guidelines
+
+Thank you for your interest in contributing to onefetch! Whether it's a bug report, new feature, correction, or additional 
+documentation, we greatly value feedback and contributions from our community.
+
+Please read through this document before submitting any issues or pull requests to ensure we have all the necessary 
+information to effectively respond to your bug report or contribution.
+
+## Reporting Bugs/Feature Requests
+
+We welcome you to use the GitHub issue tracker to report bugs or suggest features.
+
+When filing an issue, please check [existing open](https://github.com/o2sh/onefetch/issues), or [recently closed](https://github.com/o2sh/onefetch/issues?utf8=%E2%9C%93&q=is%3Aissue%20is%3Aclosed%20), issues to make sure somebody else hasn't already 
+reported the issue. Please try to include as much information as you can. Details like these are incredibly useful:
+
+* A reproducible test case or series of steps
+* The version of our code being used
+* Any modifications you've made relevant to the bug
+* Anything unusual about your environment or deployment
+
+## Contributing via Pull Requests
+
+Contributions via pull requests are much appreciated. Before sending us a pull request, please ensure that:
+
+1. You are working against the latest source on the *master* branch.
+2. You check existing open, and recently merged, pull requests to make sure someone else hasn't addressed the problem already.
+3. You open an issue to discuss any significant work - we would hate for your time to be wasted.
+
+To send us a pull request, please:
+
+1. Fork the repository.
+2. Modify the source; please focus on the specific change you are contributing. If you also reformat all the code, it will be hard for us to focus on your change.
+3. Ensure local tests pass.
+4. Commit to your fork using clear commit messages.
+5. Send us a pull request, answering any default questions in the pull request interface.
+6. Pay attention to any automated CI failures reported in the pull request, and stay involved in the conversation.
+
+GitHub provides additional document on [forking a repository](https://help.github.com/articles/fork-a-repo/) and 
+[creating a pull request](https://help.github.com/articles/creating-a-pull-request/).
+
+### Project-specific notes
+
+- Please ensure your changes are formatted according to `cargo fmt`.
+- Do check for linting errors with `cargo clippy`. If you're having trouble with this, feel free to ask for help.
+- Documenting your changes in `CHANGELOG.md` (in the Unreleased section) would be awesome, but is not required.
+- If you can, try to write some tests for your change (if it addresses a bug) or feature. Again, feel free to ask for help. Our CI will run these tests to ensure your code never breaks with future changes.
+
+## Finding contributions to work on
+
+Looking at the existing issues is a great way to find something to contribute on. As our projects, by default, use the default GitHub issue labels (enhancement/bug/duplicate/help wanted/invalid/question/wontfix), looking at any ['help wanted'](https://github.com/o2sh/onefetch/labels/help%20wanted) issues is a great place to start. 
+
+## Code of Conduct
+
+This project has adopted the Contributor Covenant Code of Conduct, version 2.0. It can be found in [CODE_OF_CONDUCT.md](CODE_OF_CONDUCT.md). Contributors and community members are expected to adhere to this code of conduct to create a welcoming environment.
+
+## Licensing
+
+See the [LICENSE](https://github.com/o2sh/onefetch/blob/master/LICENSE) file for our project's licensing. We will ask you confirm the licensing of your contribution.
+

README.md

@@ -27,6 +27,6 @@ You can further configure Onefetch to display exactly what you want it to. Throu
 
 Onefetch supports almost 50 different programming languages. If your language of choice isn't supported: Open up an issue and support will be added. 
 
-Contributions are very welcome! See CONTRIBUTING for more info.
+Contributions are very welcome! See [CONTRIBUTING](https://github.com/o2sh/onefetch/blob/master/LICENSE) for more info.
 
 ### More: \[[Installation](https://github.com/o2sh/onefetch/wiki/Installation)\] \[[Getting Started](https://github.com/o2sh/onefetch/wiki/getting-started)\] \[[Wiki](https://github.com/o2sh/onefetch/wiki)\]