Update README.md

Author: Beherith

README.md

@@ -1,2 +1,20 @@
 # springrts_smf_compiler
-This tool allows the compilation and decompilation of maps to springrts's binary smf map format. 
+This tool allows the compilation and decompilation of image files to SpringRTS's binary SMF (Spring Map Format) map format. 
+
+https://springrts.com/
+
+To use the tool, launch pymapconv.py
+
+Under Windows, you will need the following to make this work:
+
+Requires python 2.7 - (no surprise there) 32bit https://www.python.org/downloads/
+Requires PIL - (Python Image Library) http://www.pythonware.com/products/pil/
+Requires PyQt4 - https://riverbankcomputing.com/software/pyqt/download
+
+Under Linux (e.g. Ubuntu 14.04 and up), it requires:
+
+Python 2.7
+Pillow (sudo pip install Pillow)
+PyQt4  (sudo apt-get install python-Qt4)
+ImageMagick (sudo apt-get install imagemagick)
+