Added API documentation

InvenTree/InvenTree/urls.py

@@ -4,6 +4,7 @@ from django.contrib import admin
 from rest_framework import status
 from rest_framework.response import Response
 from rest_framework.decorators import api_view
+from rest_framework.documentation import include_docs_urls
 
 admin.site.site_header = "InvenTree Admin"
 
@@ -21,6 +22,8 @@ urlpatterns = [
     # API URL
     url(r'^api/', include(apipatterns)),
 
+    url(r'^api-doc/', include_docs_urls(title='InvenTree API')),
+
     url(r'^admin/', admin.site.urls),
     url(r'^auth/', include('rest_framework.urls', namespace='rest_framework')),
 ]