Added GitHub action for detecting broken links

Author: jaaufauvre

.github/workflows/broken-links.yml

@@ -0,0 +1,18 @@
+on:
+  push:
+    branches: master
+  schedule:
+    - cron: "0 16 * * *"
+name: broken links?
+jobs:
+  linkChecker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Link Checker
+        id: lc
+        uses: peter-evans/[email protected]
+        with:
+          args: -v -r *.md
+      - name: Fail?
+        run: exit ${{ steps.lc.outputs.exit_code }}

README.md

@@ -4,6 +4,7 @@
 [![](https://sonarcloud.io/api/project_badges/measure?project=Mastercard_client-encryption-ruby&metric=alert_status)](https://sonarcloud.io/dashboard?id=Mastercard_client-encryption-ruby)
 [![](https://sonarcloud.io/api/project_badges/measure?project=Mastercard_client-encryption-ruby&metric=coverage)](https://sonarcloud.io/dashboard?id=Mastercard_client-encryption-ruby)
 [![](https://sonarcloud.io/api/project_badges/measure?project=Mastercard_client-encryption-ruby&metric=vulnerabilities)](https://sonarcloud.io/dashboard?id=Mastercard_client-encryption-ruby)
+[![](https://github.com/Mastercard/oauth1-signer-ruby/workflows/broken%20links%3F/badge.svg)](https://github.com/Mastercard/oauth1-signer-ruby/actions?query=workflow%3A%22broken+links%3F%22)
 [![](https://img.shields.io/gem/v/mastercard-client-encryption.svg)](https://rubygems.org/gems/mastercard-client-encryption)
 [![](https://img.shields.io/badge/license-MIT-yellow.svg)](https://github.com/Mastercard/client-encryption-ruby/blob/master/LICENSE)