Add initial GH support file

(cherry picked from commit b804379463b6378e5f38803ef29ddf74adc98a9c)

docs/SUPPORT.md

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+# Support resources
+
+See the [latest documentation](http://www.glfw.org/docs/latest/) for tutorials,
+guides and the API reference.
+
+If you have questions about using GLFW, we have a
+[forum](https://discourse.glfw.org/), and the `#glfw` IRC channel on
+[Freenode](http://freenode.net/).
+
+Bugs are reported to our [issue tracker](https://github.com/glfw/glfw/issues).
+Please check the [contribution
+guide](https://github.com/glfw/glfw/blob/master/docs/CONTRIBUTING.md) for
+information on what to include when reporting a bug.
+