Add links and a quick start for minor edits

Author: CloCkWeRX

README.md

@@ -8,4 +8,6 @@ Any updates in the gh-pages branch automatically update the site within minutes.
 
 ## Contributing
 
-Refer to CONTRIBUTING.md to learn how to contribute directly to LearnOSM.
+For minor edits, simply locate the post you are interested in via the [posts](_posts) directory, and use the [edit](https://help.github.com/articles/editing-files-in-another-user-s-repository/) feature to fix typos, grammar and other minor items.
+
+To learn how to translate, run the site locally or develop new content, check out [CONTRIBUTING.md](CONTRIBUTING.md) for more on how to contribute directly to LearnOSM.