Added contributing docs and Makefile for doing checks

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+## Be Respectful
+
+We are committed to providing a friendly, safe, and welcoming environment for all, regardless of background or identity.
+
+## Expected Behavior
+
+- Use welcoming and inclusive language
+- Be respectful of differing viewpoints
+- Provide constructive feedback
+- Show empathy towards others
+
+## Unacceptable Behavior
+
+- Harassment, insults, or personal attacks
+- Discriminatory jokes or language
+- Publishing others' private information
+- Any behavior that would make others feel unsafe
+
+## Enforcement
+
+Instances of unacceptable behavior may be reported to project maintainers. All reports will be reviewed and may result in consequences ranging from warning to permanent ban.
+
+## Attribution
+
+Adapted from the [Contributor Covenant](https://www.contributor-covenant.org).