Add instructions to the README file

README.md

@@ -1 +1,15 @@
-An Inkscape extension to convert a SVG drawing to G-code. The size of the bed is controlled via the bed-width and bed-height parameters in svg2gcode.inx file.
+An Inkscape extension to convert a SVG drawing to G-code.
+
+Installation
+------------
+Copy the __svg2gcode.py__, __svg2gcode.inx__ and __shapes.py__ to Inkscape __extensions__ directory  
+
+
+* on Windows : "C:\Program Files\Inkscape\share\extensions"
+* on Linux: "/usr/share/inkscape/extensions"
+* on OS X: "/Applications/Inkscape.app/Contents/Resources/extensions"
+
+Parameters
+----------
+The size of the bed is controlled via the __bed-width__ and __bed-height__ parameters in __svg2gcode.inx__ file.
+