[Add] codecov.yml

- set code coverage in codecov

.github/workflows/codecov.yml

@@ -0,0 +1,24 @@
+name: Codecov Coverage
+
+on: [push]
+
+jobs:
+  set-codecov-test-coverage:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js 14.x
+        uses: actions/setup-node@v1
+        with:
+          node-version: 14.x
+
+      - name: Install dependencies
+        run: yarn install --immutable --immutable-cache
+
+      - name: Create Unit Test Coverage
+        run: yarn test:coverage
+
+      - name: Set unit test coverage
+        uses: codecov/codecov-action@v2
+        with:
+          fail_ci_if_error: true