Adding instructions to readme

Author: karllhughes

README.md

@@ -21,6 +21,8 @@ Related projects:
 
 This is a single file application! Upload "api.php" somewhere and enjoy!
 
+Alternatively, you can use [Composer](https://getcomposer.org/). See the _Composer Installation_ section below.
+
 ## Limitations
 
   - Primary keys should either be auto-increment (from 1 to 2^53) or UUID
@@ -1028,6 +1030,39 @@ string(6) "/posts"
 
 If it does not, something is wrong on your hosting environment.
 
+## Composer Installation
+
+- Include the library in your composer.json file:
+
+```json
+{
+    "require": {
+        "mevdschee/php-crud-api": "dev-master"
+    }
+}
+```
+
+- Run `composer install`
+- Use the library in your own code:
+
+```php
+<?php
+
+include './vendor/autoload.php';
+
+// DB Connection
+$api = new PHP_CRUD_API(array(
+ 	'dbengine'=>'MySQL',
+ 	'hostname'=>'localhost',
+ 	'username'=>'',
+ 	'password'=>'',
+	'database'=>'',
+	'charset'=>'utf8'
+));
+$api->executeCommand();
+
+```
+
 ## License
 
 MIT