Readme update.

README.md

@@ -67,3 +67,13 @@ Compiled application files will be located in `frontend/dist/`.
     python manage.py makemigrations <module-name> (e.g. python manage.py makemigrations users)
     python manage.py migrate <module-name> (e.g. python manage.py migrate users)
 
+## Database update
+
+    export LOADING_THE_SLOWOSIEC_ONTOLOGY_HIERARCHY_DISABLED=true
+    export WALENTY_FILE_NAME=<new walenty file>
+    ./update_db.sh
+    
+## Run tests
+
+    export LOADING_THE_SLOWOSIEC_ONTOLOGY_HIERARCHY_DISABLED=true
+    python manage.py test --settings=shellvalier.settings-test