added broken link checker

.github/workflows/link-checker.yaml

@@ -0,0 +1,19 @@
+on:
+ push:
+   branches: master
+name: Check markdown links
+jobs:
+  linkChecker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Link Checker
+        uses: peter-evans/link-checker@v1
+        with:
+         args: README.md
+      - name: Create Issue From File
+        uses: peter-evans/create-issue-from-file@v2
+        with:
+          title: "[Bot] Broken Links Report"
+          content-filepath: ./link-checker/out.md
+          labels: report