Initial /avilable API view and tests

src/api/views.py

@@ -0,0 +1,15 @@
+"""Internal API views"""
+
+from django.views.decorators.http import require_http_methods
+from django.http import JsonResponse
+
+@require_http_methods(["GET"])
+def available(request, domain=""):
+
+    """Is a given domain available or not.
+
+    Response is a JSON dictionary with the key "available" and value true or
+    false.
+    """
+    return JsonResponse({"available": False})
+