Update README.md

Author: domProjects

README.md

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 # CI-AdminLTE v1.7.0
+CodeIgniter 3.x with AdminLTE 2.3.x
 
 ## Demo
 
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   * French
   * Portuguese (translation by [marcelod](https://github.com/marcelod))
   * ... and more soon
- 
+
+## Server Requirements
+
+PHP version 5.6 or newer is recommended.
+
+It should work on 5.4.8 as well, but we strongly advise you NOT to run such old versions of PHP, because of potential security and performance issues, as well as missing features.
+
 ## Dependencies
 | NAME | VERSION | WEB | REPO |
 | :--- | :---: | :---: | :---: |
@@ -26,3 +33,13 @@ Support for most major browsers including Chrome, Firefox, IE9+, Opera and Safar
 | Ion Auth | 2.6.0 | [Website](http://benedmunds.com/ion_auth) | [Github](https://github.com/benedmunds/CodeIgniter-Ion-Auth)
 | jQuery | 2.2.4 | [Website](http://jquery.com) | [Github](https://github.com/jquery/jquery)
 | Font Awesome | 4.7.0 | [Website](http://fortawesome.github.io/Font-Awesome/) | [Github](https://github.com/FortAwesome/Font-Awesome)
+
+## CodeIgniter 3 Documentation
+
+* [User guide](https://codeigniter.com/user_guide)
+
+## Reference
+
+* [CodeIgniter](https://github.com/bcit-ci/CodeIgniter)
+* [Translations for CodeIgniter System](https://github.com/bcit-ci/codeigniter3-translations)
+* [AdminLTE](https://github.com/almasaeed2010/AdminLTE)