Add .codeclimate.yml file

Author: mrb

.codeclimate.yml

@@ -0,0 +1,17 @@
+engines:
+  rubocop:
+    enabled: true
+  duplication:
+    enabled: true
+    config:
+      languages:
+      - ruby
+
+ratings:
+  paths:
+  - "**.rb"
+
+exclude_paths:
+  - etc/**/*
+  - examples/**/*
+  - spec/**/*