API first version with balance service

.gitignore

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+/vendor/
+/.idea/

README.md

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-# api-php
+# SocialUP PHP API.
 
-SocialUP PHP API
+[![Latest Version](https://img.shields.io/github/release/social-up/api-php.svg?style=flat-square)](https://github.com/social-up/api-php/releases)
+[![Total Downloads](https://img.shields.io/packagist/dt/social-up/api-php.svg?style=flat-square)](https://packagist.org/packages/social-up/api-php)
+
+```php
+$client  = new \SocialUp\API\Client('YOUR_KEY');
+
+$balance = $client->balance()->get();
+```

composer.json

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+{
+  "name": "social-up/api-php",
+  "description": "SocialUP API",
+  "type": "library",
+  "require": {
+    "guzzlehttp/guzzle": "^7.5"
+  },
+  "require-dev": {
+    "roave/security-advisories": "dev-latest"
+  },
+  "license": "MIT",
+  "autoload": {
+    "psr-4": {
+      "SocialUp\\API\\": "src/"
+    }
+  },
+  "authors": [
+    {
+      "name": "SocialUp"
+    }
+  ]
+}