Update README.md

README.md

 # API-Base-Bundle
 
-Contains Entities required by many bundles
+[GitLab](https://gitlab.tugraz.at/dbp/relay/api-base-bundle) | [Packagist](https://packagist.org/packages/dbp/api-base-bundle)
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+
+This Symfony bundle contains entities required by many bundles for the DBP Relay project.
+
+## Integration into the API Server
+
+* Add the bundle package as a dependency:
+
+```
+composer require dbp/api-base-bundle
+```
+
+* Add the bundle to your `config/bundles.php`:
+
+```php
+...
+DBP\API\BaseBundle\DbpBaseBundle::class => ['all' => true],
+DBP\API\CoreBundle\DbpCoreBundle::class => ['all' => true],
+];
+```
+
+* Run `composer install` to clear caches
+