Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Thank You! :heart: :heart: :heart:
+First of all, thank you for reading this. Open source projects work best when people contribute!
+
+## How to contribute to RaspiNDI
+
+#### **Did you find a bug?**
+
+* **Ensure the bug was not already reported** by searching on GitHub under [Issues](https://github.com/raspberry-pi-camera/raspindi/issues).
+
+* If you're unable to find an open issue addressing the problem, [open a new one](https://github.com/raspberry-pi-camera/raspindi/issues/new).
+  Be sure to include a **title and clear description**, as much relevant information as possible.
+
+* If possible, use the relevant bug report templates to create the issue.
+
+#### **Did you write a patch that fixes a bug?**
+
+* Open a new GitHub pull request with the patch.
+
+* Ensure the PR description clearly describes the problem and solution. Include the relevant issue number if applicable.
+