implementing nested blueprint for api calls

app/campaigns/campaign_api/__init__.py

@@ -0,0 +1,9 @@
+from flask import Blueprint
+
+campaign_api = Blueprint('campaign_api', 
+                     __name__, 
+                     template_folder='templates', 
+                     static_folder='static',
+                     url_prefix='/campaign_api')
+
+from app.campaigns.campaign_api import routes