feat: add claude commands

dot_claude/commands/write-tests.md

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+# Test Implementation
+
+Implement or update the tests for the code changes.
+
+## Implementing Tests
+
+1. Check for staged changes with (`git status`).
+If no changes are staged, review appropriate files.
+2. Review existing unit tests for changed functionality.
+3. Identify the functionality that needs testing.
+4. Write new tests or update existing ones to cover the changes.
+5. Ensure tests are comprehensive, covering edge cases and error handling.
+6. Run the tests to verify they pass with the current code.
+
+## Best practices
+
+- Test folder structure should mirror the source code structure
+- Write tests that cover both positive and negative cases
+- Ensure tests are isolated and do not depend on external state
+- Use descriptive names for test functions
+- Keep tests small and focused on a single functionality
+- Use fixtures or setup methods to prepare the test environment