- new INSTALL.md file

INSTALLmd

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+- Please install Raspbian OS (Buster version) on RPi. GUI is not important but will give more comfort when working with RPi.
+- Install AnyDesk for RPi ( https://anydesk.com/en/downloads/raspberry-pi ) or get SSH access to be able to access RPi remotely.
+- Open terminal app on RPi and use this command to install QualTest GSM agent software in the current directory under agent_gsm/ subdirectory.
+
+  `source <(curl -s https://f.sevana.biz/agent_gsm/setup_agent_gsm.sh)`
+
+
+  This will download setup script which will setup prerequisites + run setup procedure.
+  Please follow the screen prompts.
+
+  You will be asked about:
+  - backend URL (ex: https://gsm.sevana.biz)
+  - phone name (must be already assigned in QualTest dashboard)
+  - answerer task name - this is for answering nodes only; they get its task name from config, not from the backend for now.
+
+  After setup finish and reboot (setup script will notify you) phone has to be connected.
+  Please use agent_gsm/connect_phone.sh helper script to speedup process.
+  You will need the phone's BT MAC address + confirm the connection process in the terminal and/or the phone itself.
+
+  Final step - copy license files (pvqa.lic and aqua-wb.lic) to agent_gsm/bin subdirectory.
+
+  Now please check if everything works ok in interactive mode - please run agent_gsm/run_node.sh
+  If test calls are fine - please copy from agent_gsm/config/systemd/agent_gsm.service to /etc/systemd/system
+
+  `sudo cp config/systemd/agent_gsm.service /etc/systemd/system`
+
+  `sudo systemctl enable agent_gsm`
+
+  `sudo systemctl start agent_gsm`