Improvement of github workflow and added test coverage

.github/workflows/cover.yaml

@@ -0,0 +1,15 @@
+# add public code coverage reports
+on:
+  push:
+    branches:
+    - main
+jobs:
+  coverage:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - run: "make test-cover"
+    - uses: codecov/codecov-action@v2
+    with:
+      file: ./coverage.out
+      fail_ci_if_error: true

.github/workflows/lint-link.yml

@@ -0,0 +1,22 @@
+# Check for broken links
+name: Lint Documentation
+on:
+  push:
+    paths:
+      - "docs/**"
+    branches:
+      - main
+  pull_request:
+    paths: "docs/**"
+jobs:
+  lint_docs:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with: 
+           node-version: "14" 
+      - name: Install markdown-link-check
+        run: npm install -g markdown-link-check
+      - name: markdown-link-check
+        run: find . -name \*.md | xargs -I{} markdown-link-check -c .markdownlinkcheck.json {}

.markdownlinkcheck.json

@@ -0,0 +1,10 @@
+{
+    "ignorePatterns": [{
+	"pattern": "^https://calendar.google.com/calendar"
+     }],
+     "timeout": "5s",
+     "retryOn429": true,
+     "retryCount": 5,
+     "fallbackRetryDelay": "30s",
+     "aliveStatusCodes": [200, 206]
+}