Fixed typo. Issue #744.

CONTRIBUTING.md

@@ -0,0 +1,24 @@
+## How to contribute?
+
+Everyone is welcome to contribute to bgfx by submitting bug reports, testing on
+different platforms, writing examples, improving documentation, profiling and
+optimizing, helping newcomers, telling others about bgfx, etc.
+
+## Submitting bugs
+
+Unless bug is trivial, and easy to explain and understand, the fastest way to
+fix bug is to get repro case. In most of cases it's enough to modify existing
+example (with minimal number of changes) and reproduce bug there.
+
+## Contributing code
+
+**When contributing to the bgfx project you must agree to the BSD 2-clause
+licensing terms.**
+
+Pull request checklist:
+
+ - Make sure you test your code with provided examples before creating PR.
+ - Create focused PR with minimal number of changes relevant to feature added
+   or bug fixed.
+ - Use [EditorConfig](http://editorconfig.org/) in your editor of choice to
+   apply the same editor settings used by bgfx project.