15: improve README: license, contributing: PR branch naming.

README.md

@@ -17,6 +17,18 @@ Contributing to the code:
 * create tickets
 * fork the repository
 * create a branch from a ticket
+  * branch name contains the number of the ticket and the label using **underscore** instead of space character
+  * example:
+    * ticket: 
+`
+37: Create motor encoder Fritzing component.
+`
+
+    * branch name:
+`
+37_create_motor_encoder_fritzing_component
+`
+
 * push PR
 
 Code: