add instructions to use local Docker container for Postgres

README.md

@@ -10,6 +10,7 @@ LDV Specification Application. For filling ATDB-LDV with processing tasks for LO
     - https://drive.google.com/file/d/1_j9Fp505pZTxcmzAEdgftdPkoIFrKfAX/view?usp=sharing
   
 ## Collaborate
+
   * create `your branch` from `main`
   * add your functionality
   * test your functionality locally
@@ -20,11 +21,12 @@ LDV Specification Application. For filling ATDB-LDV with processing tasks for LO
   * deploy in production, and test it
   
 ### Local update
-After a collegue has made changes, then locally
-  * git pull
-  * pip install -r requirements\dev.txt
-  * python manage.py migrate --settings=ldvspec.settings.dev  
-  
+After a collegue has made changes, then locally:
+```
+  > git pull
+  > pip install -r requirements\dev.txt
+  > python manage.py migrate --settings=ldvspec.settings.dev  
+```
   
 ## Local Development Environment
 
@@ -79,8 +81,11 @@ DATABASES = {
 }
 ```
 
-   * python manage.py migrate --settings=ldvspec.settings.dev
-   * python manage.py runserver --settings=ldvspec.settings.dev
+```
+   > python manage.py migrate --settings=ldvspec.settings.dev
+   > python manage.py runserver --settings=ldvspec.settings.dev
+   > python manage.py createsuperuser --settings=ldvspec.settings.dev
+```
    
 ## Test Environment
   * https://sdc-dev.astron.nl/ldvspec/