added recommendation requirement

CONTRIBUTING.md

@@ -1,6 +1,6 @@
 # Contribution Guidelines
 
-This is a compilation of **Free and Libre Open Source Software ([FLOSS](https://en.wikipedia.org/wiki/Free_and_open-source_software))**. Restrictive licenses (aka Freeware, Shareware) are *not awesome*.
+This is a compilation of **Free and Libre Open Source Software ([FLOSS](https://en.wikipedia.org/wiki/Free_and_open-source_software))**. Restrictive licenses (aka Freeware, Shareware) are *not awesome*. Please adhere to the following guidelines or your Pull Request will be closed.
 
 ## Commits
 * Search previous suggestions before making a new one.
@@ -14,6 +14,8 @@ This is a compilation of **Free and Libre Open Source Software ([FLOSS](https://
 * Consolidate multiple commits.
 * Use imperative (e.g. add instead of added/adding) in the PR title.
 * Include application names, categories and a link to the open source project page in the description.
+* Write a short text why the application you're adding is actually awesome.
+  * Put only stuff on the list you or another contributor can personally recommend
 
 ## Issues
 * Discussion, questions and bug reports only.