added custom permissions

settings/puckomissions.py

@@ -0,0 +1,10 @@
+from rest_framework.permissions import BasePermission
+from rest_framework.permissions import SAFE_METHODS
+
+class IsAdminOrReadOnly(BasePermission):
+
+    def has_permission(self, request, view):
+        if request.method in SAFE_METHODS:
+            return True
+
+        return bool(request.user and request.user.is_staff)