WIP: contributing guidelines

CONTRIBUTING.md

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+# Contributing to AI Router
+
+## Found a bug?
+
+If you think you found a bug, please check [Issues](https://github.com/toverainc/ai-router/issues) first, to see if it's not already reported. If the bug is already reported, avoid adding comments like that add no additional information like "I am experiencing the same bug". Instead, add a thumbs up reaction to the main comment.
+
+When you're opening a new issue, please use a clear title and description. Include a minimal config needed to reproduce the bug, and extra details about the backend if needed (e.g. vLLM v0.4.2 with mistralai/Mistral-7B-Instruct-v0.1).
+