Add organisations model and create dao

app/dao/organisations_dao.py

@@ -1,3 +1,5 @@
+from app import db
+from app.dao.dao_utils import transactional
 from app.models import Organisation
 
 
@@ -7,3 +9,8 @@ def dao_get_organisations():
 
 def dao_get_organisation_by_id(org_id):
     return Organisation.query.filter_by(id=org_id).one()
+
+
+@transactional
+def dao_create_organisation(organisation):
+    db.session.add(organisation)