added README

Author: fx

README.md

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+# Maggick!
+
+## Requirements
+
+ * bash
+ * Imagemagick (recent, might need -fx)
+ * for animated gifs or icons from the editor: ffmpeg and gifsicle
+
+## Creating unit icons
+
+ 1. Extract btn-unit* (and all files from special cases below) from base.MPQ and throw them in units/dds/
+ 2. `cd units && bash gen.sh <size>`
+ 3. profit.
+
+### Special cases:
+
+There are no unit buttons for buildings, so you should also copy the following files:
+
+btn-building-terran-planetaryfortress.dds
+btn-building-protoss-photoncannon.dds
+btn-building-terran-bunker.dds
+btn-building-zerg-spinecrawler.dds
+btn-building-zerg-sporecrawler.dds
+btn-building-terran-autoturret.dds
+btn-building-terran-missileturret.dds
+btn-building-zerg-nydusworm.dds
+
+Note: they're all already there - these copying instructions are for updates, whenever necessary.
+
+Not that it will matter, but I'd recommend using something like midnight commander or total commander to simply exctract every texture and match the two directories (Shift+F2 in total commander) or just write a quick shellscript (which I didn't have to, because I have the awesome total commander on windows.)