Merge pull request #4 from fabaff/install

Add steps to compile

README.md

@@ -5,4 +5,16 @@ This utility is used to annotate images with the location and numbers of the lic
 The utility is a QT graphical user interface written in C++:
 ![Plate Image](http://www.openalpr.com/images/demoscreenshots/tagger_screenshot.jpg "Input image")
 
-Download an installer for Windows, Ubuntu Linux, or Mac OS from the Releases tab.  Alternatively, you can compile the tool yourself using qmake or cmake.
+## Installation
+
+Download an installer for Windows, Ubuntu Linux, or Mac OS from the Releases tab.  Alternatively, you can compile the tool yourself using `qmake` or `cmake`. Eg. on a Fedora-based system (assuming that the required tools are already installed):
+
+```bash
+$ git clone https://github.com/openalpr/plate_tagger.git
+$ cd plate_tagger
+$ mkdir build && cd build
+$ cmake ..
+$ make
+$ ./openalpr_tagger
+```
+