Merge pull request #1 from sarahman/master

README.md file has been created.
@sarahman great. Thank you.

README.md

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+## Simple Cache Client Adapter ##
+PHP Cache library built by PSR-16 simple cache interface
+
+You can find implementations of the specification by looking for packages providing the psr/simple-cache-implementation virtual package.
+
+#### Installation
+- Run this command: `composer require previewtechs/simple-cache:dev-master`
+
+#### Usages
+- Create a file named `test.php` in your root directory and add these following codes: 
+```php
+<?php
+
+require "vendor/autoload.php";
+
+$cache = new Memcached();
+$cache->addServers([
+    ['localhost', 11211, 1]
+]);
+
+$cache = new Previewtechs\SimpleCache\Memcached($cache);
+
+// Set Cache key.
+$data = [
+    'sample' => 'data',
+    'another' => 'data'
+];
+
+$cache->set('your_custom_key', $data);
+
+// Check cached key exists or not.
+$cache->has('your_custom_key');
+
+// Get Cached key data.
+$cache->get('your_custom_key');
+
+```
+- then run `php test.php`
+
+#### For Documentations
+[psr/simple-cache-implementation](https://packagist.org/providers/psr/simple-cache-implementation)