Update Readme
Update Readme

Add section for using the hackweek docker containers.
Based on the description of #253.

Co-authored-by: Henne Vogelsang <1d27dfd08ef6b1794d36a61ba745b6f8865e4c13@opensuse.org>

hennevogel/hackweek,srinidhibs/hackweek,hennevogel/hackweek,SUSE/hackweek,hennevogel/hackweek,srinidhibs/hackweek,srinidhibs/hackweek,SUSE/hackweek,srinidhibs/hackweek,SUSE/hackweek