Added codecov file

codecov.yml

@@ -0,0 +1,16 @@
+coverage:
+  round: up
+  range: 50..80
+
+  status:
+    project: # settings affecting project coverage
+      default:
+        enabled: yes
+        target: auto # auto % coverage target
+        threshold: 5%  # allow for 5% reduction of coverage without failing
+
+    # do not run coverage on patch nor changes
+    patch:
+      default:
+        enabled: false
+    changes: no