[PhpMetrics] added metrics evaluation

README.md

@@ -2,25 +2,29 @@
 
 Samshal\Acl adds a role based permission system for user authentication. In general, it provides a lightweight access control list for privileges and permission management.
 
-## Why you might need it
+### Why you might need it
 
 Access Control Lists allow an application to control access to its areas, they provide a flexible interface for creating Permissions, Roles, Resources and assigning the created permissions on roles based restricting/granting access to resources.
 
 This component is an implementation of an ACL, it makes it easy for you to get up and running with user authorization.
 
-## Class Features
+### Class Features
 - Creation of Resources, Roles and Permissions
 - Ability to set Permissions on Resources and granting these Permissions to Roles.
 - Fully Serializable, can work interoperably with any source of data.
 - Compatible with PHP v7.0+
 - Easy to use
 
-**Resources** are objects which acts in accordance to the permissions defined on them by the ACLs. **Roles** are objects that requests access to resources and can be allowed or denied by the ACL layers. **Permissions** are just rules defined on Resources. 
+**Resources** are objects which acts in accordance to the permissions defined on them by the ACLs. **Roles** are objects that requests access to resources and can be allowed or denied by the ACL layers. **Permissions** are just rules defined on Resources.
 
-## License
+### Metrics of master branch
+
+![Package Metrics](https://cdn.rawgit.com/samshal/acl/master/phpmetric-maintainability.svg)
+
+### License
 This software is distributed under the [MIT](https://opensource.org/licenses/MIT) license. Please read LICENSE for information on the software availability and distribution.
 
-## Installation
+### Installation
 Samshal\Acl is available via [Composer/Packagist](https://packagist.org/packages/samshal/acl), so just add this line to your `composer.json` file:
 ```json
 	{