Updated readme

Author: PeeHaa

README.md

@@ -4,6 +4,16 @@ Theme package of the CodeCollab project
 
 [![Build Status](https://travis-ci.org/CodeCollab/Theme.svg?branch=master)](https://travis-ci.org/CodeCollab/Theme) [![MIT License](https://img.shields.io/badge/license-MIT-blue.svg)](mit) [![Latest Stable Version](https://poser.pugx.org/codecollab/theme/v/stable)](https://packagist.org/packages/codecollab/theme) [![Total Downloads](https://poser.pugx.org/codecollab/theme/downloads)](https://packagist.org/packages/codecollab/theme) [![Latest Unstable Version](https://poser.pugx.org/codecollab/theme/v/unstable)](https://packagist.org/packages/codecollab/theme)
 
+## Installation
+
+Include the library in your project using composer:
+
+    {
+        "require-dev": {
+            "codecollab/theme": "^1"
+        }
+    }
+
 ## Requirements
 
 PHP7+
@@ -16,5 +26,9 @@ PHP7+
 
 [MIT][mit]
 
+## Security issues
+
+If you found a security issue please contact directly by mail instead of using the issue tracker at codecollab-security@pieterhordijk.com
+
 [contributing]: https://github.com/CodeCollab/Theme/blob/master/CONTRIBUTING.md
 [mit]: http://spdx.org/licenses/MIT