Updated read me

Author: adaam2

README.md

@@ -71,12 +71,18 @@ Killing the application (and remove data volumes):
 docker-compose down --volumes
 ```
 
-Running RSpec tests:
+Running backend RSpec tests:
 
 ```
 docker-compose run backend rspec
 ```
 
+Running Jest (JS) specs:
+
+```
+dc run frontend yarn test
+```
+
 # Architecture
 
 The application can be built using `docker-compose up --build`.