Add README

README.md

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+Tigerbay PHP
+============
+
+
+
+Usage
+-----
+
+### Initialize The Client
+~~~php
+use Mrzen\Tigerbay;
+
+$config = (new Tigerbay\Config())->setBaseURL($baseURL)         // Required
+                                 ->setClientId($clientId)       // Required
+                                 ->setSecret($clientSecret)     // Required
+                                 ->setTimeout(10.0)             // Optional
+
+$client = new Tigerbay\Client($config);
+
+// Get cache stats
+
+$stats = $client->stats();
+
+echo 'System contains ' . $stats->getItemCount() . ' tours';
+~~~