Added the start of a styleguide

contributing.md

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+# Contributing
+
+This project is a work in progress. Contributions are very welcome.
+
+That said, we'd like to maintain some consistency across the document.
+
+## Style guide
+1. Every definition should include at least one JavaScript code example.
+1. Definitions should be written using the simplest language possible. Every word should tell.
+1. Target programmers that have no functional programming experience.
+1. We value understandability more than accuracy. e.g. It's okay to describe a functor as a container.
+1. Don't overuse jargon even if defined elsewhere in the document.
+1. Link to terms defined else where in the document when you use them.
+1. No big walls of text
+
+## Code conventions
+Be consistent with other examples
+
+* Prefer arrow functions
+* Parenthesis around function arguments
+* Put output values in comments
+* Use semi-colons
+* Keep it short and simple
+
+This styleguide is a WIP too! Send PRs :)