Update README to detail best pull request style

Author: tnm

README.md

@@ -15,6 +15,18 @@ For more information on gitignore: [gitignore(5)][g5]
 [pr]: http://help.github.com/pull-requests/
 [g5]: http://man.cx/gitignore
 
+## Pull Requests
+
+Since this repo includes a large and diverse
+number of programming languages, frameworks, editors,
+and ecosystems, it's **very helpful** if you can provide 
+a link to information supporting your pull request. 
+Up-to-date, canonical documentation that mentions the files 
+to be ignored is best.
+
+This ensures we can efficiently go through pull requests
+and keep quality high.
+
 ## Global Ignores
 
 git has a global configuration that applies rules to all of