Add submission instructions to page.

docs/modules/wiki/pages/atom_snippets.adoc

@@ -1,5 +1,7 @@
 = Atom Snippets
 
+Copy and paste this text into your Atom Editor menu:File[Snippets...] page to add some useful shortcuts. Feel free to contribute any changes so other editors can benifit by selecting the "`Edit this Page`" link in the header of this page and submitting a pull request in the wiki repo.
+
 ```
 # Your snippets
 #