Add start contributing doc

Author: abby-ql

src/community/start-contributing.md

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+# Start Contributing to Typelevel
+
+Typelevel projects power a large part of the functional Scala ecosystem. They are also complex, long-lived codebases with active communities. Contributing can feel intimidating at first, but the path in is actually quite simple! A practical path that works well across most Typelevel repositories:
+
+#### Find something that can be improved
+   - Look for open issues, especially those labeled `good first issue` or `help wanted`.
+   - Browse the curated [good-first-issues board](https://github.com/orgs/typelevel/projects/1/)
+   - If you're already using the library, improve something that bothered you.
+   - Documentation and tests are excellent starting points too.
+
+#### Understand the problem first
+   - Read the issue carefully, understand the current implementation.
+   - Look for existing PRs or recent comments
+   - Check whether a solution was already proposed.
+
+#### Communication is Key
+   - Comment on the issue saying you'd like to work on it and briefly describe your idea or approach.
+   - Ask clarifying questions if anything is unclear.
+   - If the change is small, you can open a draft PR early to get feedback.
+
+#### Open a PR and iterate
+   - Fork the repo, create a branch, and implement the change. Add or update tests where appropriate.
+   - Open a PR with a clear description of the problem and your solution. Read the [Typelevel AI policy](https://typelevel.org/gsoc/ai.html).
+   - Expect review feedback, ask questions, adjust your changes, and iterate.
+
+#### Become a User First
+
+Build something small with Cats Effect. Try streaming something with FS2. Use http4s for a simple service. Build with [Typelevel Toolkit](https://typelevel.org/blog/). 
+A common piece of advice from the community is:
+
+> Become a user of the ecosystem you want to contribute to.
+
+#### Where to Ask for Help
+
+- Join the [Typelevel Discord](https://discord.gg/typelevel-632277896739946517)
+- Ask in `#starting-contributing` if you're new to contributing.
+- Use library-specific channels like `#cats`, `#cats-effect`, `#fs2`, or `#http4s` for more focused questions.
+- You can also ask directly on a GitHub issue if your question is specific to that issue.