Add root API showing the new endpoints.

Signed-off-by: Michael Price <loneviking72@gmail.com>

mayan/apps/rest_api/serializers.py

@@ -0,0 +1,8 @@
+from __future__ import unicode_literals
+
+from rest_framework import serializers
+
+
+class EndpointSerializer(serializers.Serializer):
+    label = serializers.CharField(read_only=True)
+    url = serializers.URLField(read_only=True)