Add Claude instructions

CLAUDE.md

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+# Instructions
+
+- Never do any commits.
+- Keep answers short and concise.
+- Don't do huge comments. Make them very short and only when necessary.
+- Any comment that doesn't add more context than the code already provides should be omitted.
+- Match the comment style of the rest of the project.
+- Instead of commenting a block about what a function does, use short one-liner comments over sections of code within it. For example, where there are nested for loops and if statements, have one comment saying `# Find node based on criteria`.
+- Always check syntax with the game engine.
+- Read logs to confirm expected behavior when possible.
+
+## About the project
+- All players will always play as clients. The server will be headless.