Added GitHub action for detecting broken links, fixed link

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

@@ -1,7 +1,8 @@
 # client-encryption-php
 
 [![](https://travis-ci.org/Mastercard/client-encryption-php.svg?branch=master)](https://travis-ci.org/Mastercard/client-encryption-php)
-[![](https://sonarcloud.io/api/project_badges/measure?project=Mastercard_client-encryption-php&metric=alert_status)](https://sonarcloud.io/dashboard?id=Mastercard_client-encryption-php) 
+[![](https://sonarcloud.io/api/project_badges/measure?project=Mastercard_client-encryption-php&metric=alert_status)](https://sonarcloud.io/dashboard?id=Mastercard_client-encryption-php)
+[![](https://github.com/Mastercard/client-encryption-php/workflows/broken%20links%3F/badge.svg)](https://github.com/Mastercard/client-encryption-php/actions?query=workflow%3A%22broken+links%3F%22)
 [![](https://img.shields.io/packagist/v/mastercard/client-encryption.svg)](https://packagist.org/packages/mastercard/client-encryption)
 [![](https://img.shields.io/badge/license-MIT-yellow.svg)](https://github.com/Mastercard/client-encryption-php/blob/master/LICENSE)
 
@@ -301,7 +302,7 @@ $config = FieldLevelEncryptionConfigBuilder::aFieldLevelEncryptionConfig()
 
 See also:
 * [FieldLevelEncryptionConfig.php](https://github.com/Mastercard/client-encryption-php/blob/master/src/Developer/Encryption/FieldLevelEncryptionConfig.php) for all config options
-* [Service configurations in PHP](https://github.com/Mastercard/client-encryption-php/wiki/Service-Configurations-in-PHP) wiki page
+* [Service Configurations for Client Encryption PHP](https://github.com/Mastercard/client-encryption-php/wiki/Service-Configurations-for-Client-Encryption-PHP)
 
 ##### Encrypting Using HTTP Headers