Add README and LICENSE

README.md

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+# setup-php
+
+<p align="left">
+  <a href="https://github.com/shivammathur/setup-php"><img alt="GitHub Actions status" src="https://github.com/shivammathur/setup-php/workflows/Main%20workflow/badge.svg"></a>
+</p>
+
+This action sets up a php environment for use in actions by:
+
+- optionally installing a version of PHP and adding to PATH. Along with php it also installs composer
+
+# Usage
+
+See [action.yml](action.yml)
+
+Basic:
+```yaml
+steps:
+- name: Checkout
+  uses: actions/checkout@master
+- name: Installing PHP
+  uses: shivammathur/setup-php@master
+  with:
+    php-version: 7.3
+- name: Check PHP Version
+  run: php -v
+- name: Check Composer Version
+  run: composer -V
+```
+
+Matrix Testing:
+```yaml
+jobs:
+  run:    
+    runs-on: ${{ matrix.operating-system }}
+    strategy:
+      max-parallel: 15
+      matrix:
+        operating-system: [ubuntu-latest, windows-latest, macOS-latest]
+        php-versions: ['5.6', '7.0', '7.1', '7.2', '7.3']
+    name: PHP ${{ matrix.php-versions }} Test
+    steps:
+    - name: Checkout
+      uses: actions/checkout@master
+    - name: Install PHP
+      uses: shivammathur/setup-php@develop
+      with:
+        php-version: ${{ matrix.php-versions }}
+    - name: Check PHP Version
+      run: php -v
+
+```
+
+# License
+
+The scripts and documentation in this project are released under the [MIT License](LICENSE)
+
+# Contributions
+
+Contributions are welcome!  See [Contributor's Guide](docs/contributors.md)