update contributing docs (#38)

create `CONTRIBUTING.md` and update contributing docs

CONTRIBUTING.md

@@ -0,0 +1,12 @@
+# Contributing to paspybin
+
+Thank you for your interest in contributing to paspybin!
+We welcome contributions from everyone. Before you get
+started, please take a moment to review the following
+guidelines.
+
+## How to Contribute
+
+To learn how to contribute to paspybin, please refer to
+our [Contributing Guide](https://paspybin.readthedocs.io/en/latest/how-to-guides/#contributing)
+on the paspybin documentation site.

docs/how-to-guides.md

@@ -2,6 +2,27 @@
 
 ## Contributing
 
+Thank you for your interest in contributing to paspybin!
+We welcome contributions from everyone. Before you get
+started, please take a moment to review the following
+guidelines.
+
+### Code of Conduct
+
+Please note that this project adheres to the Contributor
+Covenant Code of Conduct. By participating, you are
+expected to uphold this code. Please report any
+unacceptable behavior.
+
+### Ways to Contribute
+
+Here are a few ways you can contribute to paspybin:
+
+- Reporting bugs
+- Suggesting new features
+- Writing or improving documentation
+- Submitting bug fixes or enhancements via Pull Requests
+
 ### Getting Started
 
 You can contribute directly to paspybin by submit a pull
@@ -58,7 +79,8 @@ dependency with the following command:
 poetry install
 ```
 
-And done! You can contribute directly by getting your hands wet.
+And done! You can make your changes and test thoroughly.
+Then push your branch to your fork and submit a pull request.
 
 !!! tip
     If you have installed [poethepoet](https://poethepoet.natn.io/index.html)
@@ -155,3 +177,8 @@ release to GitHub. The special environment for people who have access
 to the workflow is in the GitHub environment with the name `production`.
 Each release tag must be the same as `version` in `pyproject.toml` in
 the `tool.poetry` section.
+
+### License
+
+By contributing to paspybin, you agree that your contributions will be
+licensed under the project's [MIT License](https://github.com/kiraware/paspybin/blob/main/LICENSE).