Create CONTRIBUTING.md

avoid kind people's work being out of scope

Author: timruffles

CONTRIBUTING.md

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+# Contributing to Javascript Garden
+
+1. we're about Javascript AKA [ECMA script](http://www.ecma-international.org/ecma-262/5.1/) not a specific implementation. So we don't cover issues specific to one environment or interpreter, like browsers or V8 for node.
+1. micro-performance is out of scope: anything that's not a result of essential algorithmic complexity (e.g O(log n) vs O(n^2)) is down to a specific version of a specific interpreter (see 1).
+1. please test code examples to ensure they work, there's nothing more confusing than incorrect examples!
+1. contributing to JS garden makes you a fantastic person, and Brendan Eich will find you immensely attrative.
+
+Thank you for being kind enough to help out!