Add usage instructions.

Author: catree

README.md

@@ -1,4 +1,4 @@
-Face Detection + Auto Labelling
+Face Detection + Auto Labelling (Alpha version)
 ====================
 
 Face Detection on school year group photo and automatic labelling.
@@ -10,12 +10,20 @@ Face Detection on school year group photo and automatic labelling.
 href="http://creativecommons.org/licenses/by-sa/3.0">CC BY-SA 3.0</a> via <a href="https://commons.wikimedia.org/wiki/">Wikimedia Commons</a>.
 
 
+## Usage
+- File > Open: Open a dialog to select the desired images
+- When an image is loaded, a double left click will delete (after a confirmation) the label located under the mouse cursor (known issue: it is sometimes buggy, retry multiple times).
+- When an image is loaded, a right click will add a label. A dialog will show and ask for the label number.
+- Use the "<" and ">" buttons to load the previous and next images.
+- File > Save to directory: Open a dialog to select the directory where will be saved the images. If a file with the same name already exists, it will be asked if we want to overwrite or not the file.
+
+
 ## Development environment
 - Windows 7 64 bits
 - Visual Studio 2010
 - OpenCV 2.4.10
 - Qt 5.5.0
-- binarie compiled in 32 bits release mode
+- binarie(Alpha version) compiled in 32 bits release mode
 
 
 ## Known issues
@@ -25,3 +33,4 @@ href="http://creativecommons.org/licenses/by-sa/3.0">CC BY-SA 3.0</a> via <a hre
 ## TODO
 - [ ] Add a setting dialog to allow the modification of some parameters (Cascade classifier learning file, size of the label box, etc.)
 - [ ] Try to find a way to use more classical fonts than those provided by OpenCV
+- [ ] Try to find a way to display a better image than the raw RGB888