add button!

ui/views.py

@@ -0,0 +1,14 @@
+from django.shortcuts import render
+from django.http import JsonResponse
+
+def button(request):
+    PRESSED = 'pressed'
+    try:
+        request.session[PRESSED]
+    except KeyError:
+        request.session[PRESSED] = 0
+
+    if request.method == "POST":
+        request.session[PRESSED] += 1
+        return JsonResponse({PRESSED: request.session[PRESSED]})
+    return render(request, "ui/button.html", {PRESSED: request.session[PRESSED]})