feat: add roles and permissions component (#342)

Fixes #175

src/app/system/system.service.ts

@@ -32,6 +32,13 @@ export class SystemService {
     return this.http.get('/hooks');
   }
 
+  /**
+   * @returns {Observable<any>} Fetches Roles and Permissions
+   */
+  getRoles(): Observable<any> {
+    return this.http.get('/roles');
+  }
+
   /**
    * @returns {Observable<any>} Fetches Codes.
    */