Keycloak added for pyvolt-dpsim-demo

[golam-shovon]

Signed-off-by: Golam Mohammad Shovon golam.shovon@eonerc.rwth-aachen.de

[m-mirz]

Some notes from our discussion:

• please try to initialize user, realm etc. in a python script
• replace images with the script mentioned before
• store configuration files and load as volume
• keep hugepages setting and add sentence about postgres compatibility
• undo the last commit and redo it in order to not create a new additional commit

[m-mirz]

Close in favor of #11