Add PR template

Signed-off-by: Hugo Mougard <[email protected]>

Author: Hugo Mougard

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,15 @@
+Please fill the `[ ]` with an `x` to make sure that you read and followed the checklist
+
+- [ ] This addition is about Machine Learning __on Code__ specifically. General links should be added to [Awesome Machine Learning](https://github.com/josephmisiti/awesome-machine-learning) instead.
+- [ ] I have checked that the proposed addition is not already in the awesome list.
+- [ ] I have signed-off my commits as detailed [here](https://github.com/src-d/guide/blob/master/developer-community/fix-DCO.md).
+- [ ] The links follow the link template:
+
+        * [Title](URL) - Description.
+    or
+
+        * [Title](URL) - Description [Code](link to code).
+- [ ] The addition is correctly classified as a paper, blog post, talk, software or dataset.
+- [ ] The commit message must start with a verb (`Add …`, `Deprecate …`) and end without a dot. For exemple:
+
+        Deprecate Theano software

CONTRIBUTING.md

@@ -46,7 +46,7 @@ The description should not start with "A" or "The". For papers, it should includ
 
 ### Format of the commit message
 
-The commit summary must start with "Add" and end with a dot.
+The commit summary must start with a verb (`Add …`, `Deprecate …`) and end __without__ a dot.
 
 ### Deprecation