docs: what we will add to config

Author: isabel-anastasiadis-boost

lib/codeclimate_diff/configuration.rb

@@ -3,5 +3,12 @@
 module CodeclimateDiff
   class Configuration
     attr_accessor :main_branch_name
+
+    #using_gitlab: true
+
+    # gitlab host
+
+    # project id
+
   end
 end