bluetooth: added bluez and bluetooth

wiki/linux/bluez.md

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+# BlueZ
+
+[BlueZ](http://www.bluez.org/) is an implementation of the
+[Bluetooth](/wiki/bluetooth.md) standard.
+This entry features the BlueZ package and all software that is based on it.
+
+## Setup
+
+On most linux distributions BlueZ can be installed with the `bluez` package.
+Additionally the `bluez-utils` package needs to be installed.
+To load the kernel module `modprobe btusb` needs to be run.
+Afterwards the
+[service](/wiki/linux/systemd.md#startstopenabledisable-a-service) can be
+started and enabled by running the following commands.
+
+```sh
+systemctl start bluetooth.service
+systemctl enable bluetooth.service
+```
+
+## Usage
+
+The Bluetooth features can be managed by different types of front-ends.
+
+- `bluetoothctl` is a command-line interface included in the `bluez-utils`
+  package
+- `bluetuith` can be used as a bluetooth manager with a terminal user interface
+  It is included in a package of the same name, that needs to be installed
+  before usage.