Add contributing file

CONTRIBUTING.md

@@ -0,0 +1,28 @@
+Thank you for your interest in contributing to the Rust In Pieces!
+
+There are a few ways of helping: critiquing the documentation and/or code examples, fixing
+incorrect information, and fixing bugs.
+
+It is encouraged for you to run the tests, formatters, and linters before submitting PRs. They will
+all need to pass before the PR can be merged so you can save youself some time by running them
+locally before submitting.
+
+## Critiquing the documentation and/or code
+
+This is the easiest way to contribute. Basically, as you read the documentation or experiment with
+the code samples, if you find something confusing, incorrect, or missing, then you can file an
+[issue](https://github.com/thedataquarry/rustinpieces/issues) explaining your concerns.
+
+## Fixing incorrect information
+
+If you find typos or incorrect links we welcome PRs to fix them. For these types of fixes there is
+no need to open an issue first. For larger changes you are encouraged to first open an issue to
+discuss the change before taking the time to make changes.
+
+## Fixing bugs
+
+If you find a bug in the code examples as you work through them, PRs for fixes are welcome. When
+fixing a bug in either a Python or Rust file please check the other language's corresponding file
+to see if the same bug exists there. If you now how to fix both then you can do both in one PR. If
+you are unsure how to make the fix in one language let us know in your PR description so we can make
+the additional fix.