Update docs/InstallationNotes.md

docs/InstallationNotes.md

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+# Installation
+
+## Create user
+```bash
+sudo adduser --disabled-login comunic_rtc_proxy
+```
+
+## Install go & build project
+As `comunic_rtc_proxy`, download & install go:
+```bash
+# Login as comunic_rtc_proxy
+sudo -u comunic_rtc_proxy bash
+cd
+
+# Download & extract go
+wget https://dl.google.com/go/go1.14.2.linux-armv6l.tar.gz
+tar -xf go1.14.2.linux-armv6l.tar.gz
+
+# Add Go to path
+export PATH=$PATH:/home/comunic_rtc_proxy/go/bin
+echo "export PATH=\$PATH:/home/comunic_rtc_proxy/go/bin" >> .bashrc
+
+# Generate go workspace
+mkdir -p go_workspace/src
+export GOPATH=$(pwd)/go_workspace
+echo "export GOPATH=\$HOME/go_workspace" >> .bashrc
+
+# Get sources & compile them
+cd $GOPATH
+git clone https://gitlab.com/comunic/ComunicRTCProxy comunic_rtc_proxy
+cd comunic_rtc_proxy/
+
+go get
+go build
+```
+
+## Generate custom configuration
+Copy the default configuration file `config.yaml` into `config.custom.yaml` and customize it to fit your needs.
+
+## Install the proxy as a service
+Create the file `/etc/systemd/system/comunic_rtc_proxy.service`:
+```conf
+[Unit]
+Description=Comunic RTC proxy
+After=syslog.target
+After=network.target
+
+[Service]
+RestartSec=2s
+Type=simple
+User=comunic_rtc_proxy
+Group=comunic_rtc_proxy
+WorkingDirectory=/home/comunic_rtc_proxy/
+ExecStart=/home/comunic_rtc_proxy/go_workspace/comunic_rtc_proxy/comunic_rtc_proxy /home/comunic_rtc_proxy/go_workspace/comunic_rtc_proxy/config.custom.yaml
+Restart=always
+Environment=USER=comunic_rtc_proxy
+
+[Install]
+WantedBy=multi-user.target
+```
+
+Enable & start the new service:
+```bash
+sudo systemctl enable comunic_rtc_proxy.service
+sudo systemctl start comunic_rtc_proxy.service
+```