Edit README

README

@@ -1 +1,20 @@
+Website:
 http://johmathe.name/shotdetect.html
+
+Dependencies:
+sudo apt-get install libavdevice-dev libavformat-dev libgd2-noxpm libgd2-noxpm-dev
+# Graphical version
+sudo apt-get install libwxgtk2.6-dev wx2.6-doc libwxgtk2.6-headers
+
+Building:
+mkdir -p build
+cd  build
+cmake ..
+
+Building a command line version:
+mkdir -p build
+cd build
+cmake -D USE_WXWIDGETS:BOOL=OFF ..
+
+Comments:
+johmathe@nonutc.fr