Add .codecov.yml

.codecov.yml

@@ -0,0 +1,21 @@
+coverage:
+  precision: 1
+  round: down
+  range: "30...100"
+
+  status:
+    project:
+      default:
+        enabled: yes
+        target: 30%
+    patch:
+      default:
+        enabled: yes
+        target: 60%
+    changes:
+      default:
+        enabled: no
+
+comment:
+  # diff, changes, footer, reach, flags, suggestions,
+  layout: "header, sunburst, tree, files"