adding category page

app/categories/controllery.py

@@ -0,0 +1,10 @@
+from flask import Blueprint, render_template, request, redirect, url_for
+from flask_login import logout_user, login_required
+import requests
+
+categories_blueprint = Blueprint('categories', __name__)
+
+@categories_blueprint.route('categories')
+@login_required
+def 
+