Select interface to use

Start miraclecast against interface of choose.

- By tagged udev device
- By `--interface` or `-i` option

resolves #36, resolves #43, resolves #46

README.md

@@ -30,7 +30,6 @@ The MiracleCast projects requires the following software to be installed:
 
 To compile MiracleCast, you can choose from [autotools](http://en.wikipedia.org/wiki/GNU_build_system) or [cmake](http://en.wikipedia.org/wiki/CMake):
 
-
 Autotools:
 
     $ ./autogen.sh
@@ -56,6 +55,14 @@ Install
 
     $ sudo make install
 
+## Automatic interface selection with udev
+
+If you want to select the interface to start miraclecast with, add a udev rule with the script [res/write-udev-rule.sh](https://github.com/albfan/miraclecast/blob/master/res/write-udev-rule.sh) and configure miraclecast with
+
+    $ ../configure --enable-rely-udev
+
+You can also choose the interface with  `--interface` option for miracle-wifid.
+
 ### Ubuntu
 
 This specific linux flavour is so hard to get miraclecast dependencies that an alternative repo was created to install systemd with dbus