Add CONTRUBITING.md

Author: Jamesllllllllll

CONTRIBUTING.md

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+## Code Checks Before Committing
+
+We use Husky and lint-staged to check your staged files.
+
+When you commit, Husky triggers lint-staged, which runs tools like ESLint and Prettier on changed files.
+
+If any issues are found, the commit is blocked until they’re fixed. Check your terminal output for linting or formatting errors.
+
+Once everything passes, you can commit successfully!