Change-Id: I777ec59ffd83b861ddc09e85e52d7a8896264b8c
It contains simple usual setups to get started with osmo-gsm-tester, such as creating a 4G network using srsLTE or a 2G network using the osmocom stack (+ ofono modems). Change-Id: I55d5b1152da201799af21a77ef6c562f97bd94fc