Add instructions to install spotifyd on FreeBSD

docs/src/installation/FreeBSD.md

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+# FreeBSD install guide
+
+This guide will help you to install `spotifyd` on FreeBSD and have it always running.
+
+`spotifyd` is available for the FreeBSD architectures :
+
+* amd64
+* i386
+* arm64
+
+## Install
+
+```sh
+sudo pkg install spotifyd
+```
+
+## Config file
+
+
+Input the following data. Change the **username**, **password**, **device_name**, and the **bitrate**.
+
+```toml
+[global]
+username = "USER"
+password = "PASS"
+backend = "portaudio"
+device = "/dev/dsp"
+#onevent = command_run_on_playback_event
+device_name = "name_in_spotify_connect"
+bitrate = 96|160|320
+cache_path = "cache_directory"
+volume-normalisation = true
+normalisation-pregain = -10
+```
+
+## Start the service
+
+```bash
+sudo service spotifyd onestart
+```
+
+Now see if you can find it in the normal Spotify client (Devices in right bottom corner). Retry the above steps if you can't find it.
+
+## Starting spotifyd at boot
+
+```sh
+sudo sysrc spotifyd_enable=YES
+```