Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+There are several ways to contribute. Read on to figure out which one might suit you best.
+
+## Questions
+
+If you've got a question, ask it on the Issues tracker. One question per issue please!
+
+## Changes to the notebooks
+
+If you'd like to propose a change to the notebooks, do the following:
+
+1. Fork the repository.
+1. Create a new branch, and make your proposed changes.
+1. Submit a Pull Request (PR) back to this repository (`ericmjl/bayesian-analysis-recipes`).
+
+## New notebooks
+
+The criteria for new notebooks is as follows:
+
+1. It should not be math-heavy.
+1. It should express the simplest complex version of a recipe.
+1. It should look recipe-like - that is, someone else can simply plug in their own data, as long as the data are formatted correctly.