add info in readme itself

Signed-off-by: Tushar912 <tushar.912u@gmail.com>

Author: tushar912

README.rst

@@ -147,6 +147,12 @@ Data import
 
     DJANGO_DEV=1 python manage.py import --all
 
+It is not required to run all the importers . In fact it is suggested
+to run only a few importers via 
+:: 
+
+    DJANGO_DEV=1 python manage.py import rust ruby
+
 If you want to run the import periodically, you can use a systemd timer:
 
 ::