Add github workflow

Author: byjg

.github/workflows/phpunit.yml

@@ -0,0 +1,43 @@
+name: PHPUnit
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - "*.*.*"
+  pull_request:
+    branches:
+      - master
+  schedule:
+    - cron: "0 8 * * 1"
+
+jobs:
+  Build:
+    runs-on: 'ubuntu-latest'
+    container: 'byjg/php:${{ matrix.php-version }}-cli'
+    strategy:
+      matrix:
+        php-version:
+          - "8.1"
+          - "8.0"
+          - "7.4"
+          - "7.3"
+          - "7.2"
+          - "7.1"
+          - "7.0"
+          - "5.6"
+
+    steps:
+      - uses: actions/checkout@v2
+      - run: composer install
+      - run: ./vendor/bin/phpunit
+
+  Documentation:
+    runs-on: 'ubuntu-latest'
+    needs: Build
+    if: github.ref == 'refs/heads/master'
+    env:
+      DOC_GITHUB_TOKEN: '${{ secrets.DOC_TOKEN }}'
+    steps:
+      - uses: actions/checkout@v2
+      - run: curl https://opensource.byjg.com/add-doc.sh | bash /dev/stdin php singleton

README.md

@@ -1,18 +1,8 @@
 # Singleton Pattern
 
-[![Build Status](https://travis-ci.org/byjg/SingletonPatternPHP.svg?branch=master)](https://travis-ci.org/byjg/SingletonPatternPHP)
-[![Maintainable Rate](https://sonarcloud.io/api/project_badges/measure?project=SingletonPatternPHP&metric=sqale_rating)](https://sonarcloud.io/dashboard?id=SingletonPatternPHP)
-[![Reliability Rate](https://sonarcloud.io/api/project_badges/measure?project=SingletonPatternPHP&metric=reliability_rating)](https://sonarcloud.io/dashboard?id=SingletonPatternPHP)
-[![Security Rate](https://sonarcloud.io/api/project_badges/measure?project=SingletonPatternPHP&metric=security_rating)](https://sonarcloud.io/dashboard?id=SingletonPatternPHP)
-[![Quality Gate](https://sonarcloud.io/api/project_badges/measure?project=SingletonPatternPHP&metric=alert_status)](https://sonarcloud.io/dashboard?id=SingletonPatternPHP)
-[![Code Coverage](https://sonarcloud.io/api/project_badges/measure?project=SingletonPatternPHP&metric=coverage)](https://sonarcloud.io/dashboard?id=SingletonPatternPHP)
-[![Bugs](https://sonarcloud.io/api/project_badges/measure?project=SingletonPatternPHP&metric=bugs)](https://sonarcloud.io/dashboard?id=SingletonPatternPHP)
-[![Code Smells](https://sonarcloud.io/api/project_badges/measure?project=SingletonPatternPHP&metric=code_smells)](https://sonarcloud.io/dashboard?id=SingletonPatternPHP)
-[![Techinical Debt](https://sonarcloud.io/api/project_badges/measure?project=SingletonPatternPHP&metric=sqale_index)](https://sonarcloud.io/dashboard?id=SingletonPatternPHP)
-[![Vulnerabilities](https://sonarcloud.io/api/project_badges/measure?project=SingletonPatternPHP&metric=vulnerabilities)](https://sonarcloud.io/dashboard?id=SingletonPatternPHP)
-
+[![Opensource ByJG](https://img.shields.io/badge/opensource-byjg-success.svg)](http://opensource.byjg.com)
 [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/byjg/SingletonPatternPHP/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/byjg/SingletonPatternPHP/?branch=master)
-[![Code Climate](https://codeclimate.com/github/byjg/SingletonPatternPHP/badges/gpa.svg)](https://codeclimate.com/github/byjg/SingletonPatternPHP)
+[![Build Status](https://github.com/byjg/SingletonPatternPHP/actions/workflows/phpunit.yml/badge.svg?branch=master)](https://github.com/byjg/SingletonPatternPHP/actions/workflows/phpunit.yml)
 
 
 A lightweight PHP implementation of the Design Pattern Singleton using trait.
@@ -55,3 +45,5 @@ composer require "byjg/singleton-pattern=~1.0"
 * https://en.wikipedia.org/wiki/Singleton_pattern
 
 
+----
+[Open source ByJG](http://opensource.byjg.com)