Added a user system with no proper user validation but working authorisation.

backend/requests/gamenights.sh

@@ -0,0 +1,3 @@
+echo $JWT
+
+curl -X GET -H "Authorization: Bearer ${JWT}" localhost:8000/api/gamenights

backend/requests/login.sh

@@ -0,0 +1 @@
+curl -X POST -H "Content-Type: application/json" -d '{"username": "a", "password": "c"}' localhost:8000/api/login

backend/requests/register.sh

@@ -0,0 +1 @@
+curl -X POST -H "Content-Type: application/json" -d '{"username": "a", "email": "b", "password": "c", "password_repeat": "d"}' localhost:8000/api/register