Adding coverage badge.

.github/workflows/coverage-badge.yml

@@ -0,0 +1,19 @@
+name: Make Coverage Badge
+on: [pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: action-badges/[email protected]
+        with:
+          branch-name: badges
+
+      - name: Make Coverage Badge
+        uses: action-badges/[email protected]
+        with:
+          file-name: coverage.svg
+          badge-branch: badges
+          github-token: '${{ secrets.GITHUB_TOKEN }}'
+          coverage-file-name: ./coverage.xml