Create CONTRIBUTING.md

.github/CONTRIBUTING.md

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+# Contributing to ChaiScript
+
+Thank you for contributing!
+
+# Pull Requests
+
+Please follow the existing style in the code you are patching.
+
+ - two space indent
+ - no tabs EVER
+ - match the existing indentation level
+
+All ChaiScript commits are run through a large set of builds and analysis on all supported platforms. Those results are posted on the 
+[build dashboard](http://chaiscript.com/ChaiScript-BuildResults/index.html). No PR will be accepted until all tests pass.
+
+The build system has full integration with GitHub and you will be notified automatically if all tests have passed.
+
+# Issues
+
+Please do not post a "chaiscript is too slow", "chaiscript compiles too slowly", or "chaiscript needs more documentation" issue
+without first reading the following notes.
+
+## ChaiScript is Too Slow
+
+We are actively working on constently improving the runtime performance of ChaiScript. With the performance being
+[monitored with each commit](http://chaiscript.com/ChaiScript-BuildResults/performance.html).
+
+If you feel you *must* post an issue about performance, please post a complete example that illustrates the exact case you
+feel should be better optimized.
+
+Any issue request regarding performance without a complete example of the issue experienced will be closed.
+
+## ChaiScript Compiles Too Slowly
+
+This is also something we are actively working on. If you need highly optimized build times, please see [this discussion
+on the discourse site](http://discourse.chaiscript.com/t/slow-build-times/94).
+
+## ChaiScript Needs More Documentation
+
+If you have a question that is not addressed in the [cheatsheet](https://github.com/ChaiScript/ChaiScript/blob/develop/cheatsheet.md) 
+please open an issue so we can get the Cheatsheet updated.