Modify csrf

Author: DevAmirul

README.md

@@ -73,6 +73,12 @@ composer dump-autoload
 composer app
 ```
 
+Start PHP server.
+
+```bash
+composer start
+```
+
 ## Examples:
 
 #### Basic route:

src/Router.php

@@ -46,6 +46,9 @@ class Router {
     public Request $request;
 
     private function __construct() {
+        // Start session.
+        session_start();
+
         // Define all http verbs.
         $this->allMethods = ['get', 'post', 'delete', 'put', 'patch'];