Adding Guidance Documentation for Contributors

CONTRIBUTORS.md

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+## Guidance for Contributors
+
+We would sincerely appreciate your contributions to the [FastA2A](https://ai.pydantic.dev/a2a/) project.
+
+### Areas of Contribution
+
+You can contribute to the project in the following areas:
+- project documentation
+- python code updates (adding functionality, fixing bugs, adding code documentation etc.)
+- writing new unit tests, fixing existing unit tests
+- reporting issues
+- making suggestions for feature requests and improvements
+- starting and contributing to discussions
+- reviewing pull requests
+- responding to issues and discussions
+- creating examples and tutorials for the [FastA2A](https://ai.pydantic.dev/a2a/) project.
+
+Before reporting new issues, take a look at [existing issues](https://github.com/pydantic/fasta2a/issues) to ensure that you are not creating duplicates.
+
+### Pre-Commit Checks before Sending in your Pull Requests
+
+Clone a fork of the [FastA2A repo](https://github.com/pydantic/fasta2a/fork) and cd into that directory
+
+```bash
+
+git clone git@github.com:<yourUsername>/fasta2a.git
+
+cd fasta2a 
+
+```
+
+Install uv (version 0.4.30 or later)
+
+### Running Lints and Tests etc
+
+Run the following commands before checking in your changes to git. 
+
+Your PR may not be accepted if it fails these checks.
+
+It is usually a good idea to keep the branch in your fork up-to-date with the upstream branch if you are planning 
+to work on your changes over an extended period of time.
+
+```bash
+
+# Run linters
+uv run scripts/check
+
+# Run unit tests
+uv run scripts/test
+
+```
+
+### Additional Questions
+
+If you have additional questions you can check out the #pydantic-ai channel in the Pydantic Slack to ask questions, get help, and chat about FastA2A.
+