Created codecov.yml workflow and added the codecov badge in the READM…

…E.md file

.github/workflows/codecov.yml

@@ -0,0 +1,25 @@
+name: Workflow for Codecov
+on: [push, pull_request]
+jobs:
+  run:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up php 8.1
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.1'
+
+      - name: Install dependencies
+        run: composer self-update && composer install && composer dump-autoload
+
+      - name: Run tests and collect coverage
+        run: vendor/bin/phpunit --coverage-clover coverage.xml --configuration phpunit.xml --teamcity
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v4
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_ORG_TOKEN }}

README.md

@@ -2,6 +2,7 @@ PHP Fast JSON Patch
 =====================
 
 ![Test](https://github.com/blancks/fast-jsonpatch-php/workflows/Test/badge.svg)
+[![codecov](https://codecov.io/github/blancks/fast-jsonpatch-php/graph/badge.svg?token=3PUC5RAPPQ)](https://codecov.io/github/blancks/fast-jsonpatch-php)
 [![PHP Version Require](https://poser.pugx.org/blancks/fast-jsonpatch-php/require/php)](https://packagist.org/packages/blancks/fast-jsonpatch-php)
 [![Latest Stable Version](https://poser.pugx.org/blancks/fast-jsonpatch-php/v)](https://packagist.org/packages/blancks/fast-jsonpatch-php)