clarified language, removed more please

CONTRIBUTING.md

@@ -1,19 +1,22 @@
 # Contribution Guidelines
-Please ensure your pull request adheres to the following guidelines:
+Ensure your pull request adheres to the following guidelines:
 
-* This is an open source compilation, please check that the license of the software is suitable.
-* Search previous suggestions before making a new one, as yours may be a duplicate.
-* Make an individual commit for each suggestion.
+* This is an open source compilation.
+  * Check the license of the software is suitable.
+* Search previous suggestions before making a new one.
+  * Don't create duplicates.
+* Make an individual commit for each category.
   * Consolidate multiple commits to a pull request.
 * In pull request descriptions:
-  * Don't use past tense or present progressive (added, adding)
-  * Include the application names and categories
+  * Use imperative (e.g. add instead of added/adding).
+  * Include application names and categories.
+  * Include a link to the open source project page.
   * Example: *Add mosh, openSSH to SSH*
 * Use the following format: \[RESOURCE\]\(LINK\) - DESCRIPTION.
-* Keep descriptions short.
-* End all descriptions with a full stop/period.
+  * Keep descriptions short.
+  * End descriptions with a full stop/period.
 * Order projects alphabetically within each category.
-* Check your spelling and grammar.
-* New categories, or improvements to the existing categorisation are welcome.
+* Check spelling and grammar.
+* Improvements to the existing categorisation are welcome.
 
-Thank you for your suggestions!
+Thank you very much for your suggestions!