chore(codecov): set project coverage rules (#174)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Chores**
  - Added configuration for code coverage analysis.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

codecov.yml

@@ -0,0 +1,14 @@
+coverage:
+  status:
+    project:
+      default:
+        # Fail the build if the coverage decreases by more than 1%
+        threshold: 1%
+        # Set a minimum coverage percentage that must be met
+        target: auto
+        # The status context shown in GitHub (optional)
+        name: Coverage Check
+
+comment:
+  layout: "reach, diff, flags, files"
+  behavior: default