- Build: Add Github workflows

- Docs: Indicate current coverage on README

.github/workflows/coverage.yml

@@ -0,0 +1,16 @@
+name: Coverage
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Coverage
+      run: |
+        npm ci
+        npm run test-cov
+        exit 0