- Initial documentation on contributing to gh-ost.

- It is a bit sparse currently, but will give beginners an idea how on to setup the environment and run tests.
- A good starting point for further PR's.

doc/codingghost.md

@@ -0,0 +1,23 @@
+# Getting started with gh-ost development.
+
+## Overview
+
+Getting started with gh-ost development is simple!
+
+- First clone the repository.
+- From inside of the repository run `script/cibuild`
+- This will bootstrap the environment if needed, format the code, build the code, and then run the unit test.
+
+## CI build workflow
+
+`script/cibuild` performs the following actions:
+
+- It runs `script/bootstrap`
+- `script/bootstrap` run `script/ensure-go-installed`
+- `script/ensure-go-installed` installs go locally if (go is not installed) || (go is not version 1.7). It also will not install go if it is already installed locally.
+- `script/build` builds the binary and places in in `bin/`
+
+## Notes:
+
+Currently, `script/ensure-go-installed` will install `go` for Mac OS X and Linux. We welcome PR's to add other platforms.
+