linux/android: added android-file-transfer to mount android devices on linux

wiki/linux/android-file-transfer.md

@@ -0,0 +1,28 @@
+# android-file-transfer
+
+[android-file-transfer](https://github.com/whoozle/android-file-transfer-linux) is an MTP client
+that allows accessing the files of an [Android](/wiki/android.md)
+[smart device](/wiki/smart_devices.md#smartphones-and-tablet-computers) under
+[Linux](/wiki/linux.md).
+
+## Setup
+
+On most linux distributions Khal can be installed with the `android-file-transfer` package.
+Alternatively it can be installed via
+[GitHub](https://github.com/whoozle/android-file-transfer-linux).
+ 
+## Usage
+
+This section addresses the usage of android-file-transfer.
+
+### Mounting and Unmounting Android Device
+
+An [Android](/wiki/android.md)
+[smart device](/wiki/smart_devices.md#smartphones-and-tablet-computers) can be mounted by using the
+following command.
+Please note that this command assumes one Android device is connected via USB.
+In this case the device will be mounted on the directory `~/mnt`.
+
+```sh 
+aft-mtp-mount ~/mnt
+```