doc: README: Add more information about setup of database and role

README.md

@@ -9,8 +9,15 @@
 * start postgres
 * create postgres user
   * `$ sudo su postgres`
-  * `$ createuser --interactive` -> owl
+  * `$ createuser --interactive` -> "owl" role with relevant priviledges
+* create postgres database "matcher"
+  * `$ psql -U postgres`
+  * `> CREATE DATABASE matcher;`
+  * `> ALTER DATABASE matcher OWNER TO owl;`
 * create the db tables
+  * TODO find out where credentials are stored 
+  * setup credentials in default.py
+  * `$ python create_db.py`
 * setup a venv
   * enter the venv, e.g. in pycharm
   * `$ pip install -r requirements.txt`