Mention colors.txt generation in README

closes #86
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@ -9,6 +9,11 @@ Minetestmapper generates an overview image from a Minetest map.
A port of minetestmapper.py to C++ from https://github.com/minetest/minetest/tree/0.4.17/util.
This version is both faster and provides more features than the now obsolete Python script.
Minetestmapper ships with a colors.txt file for Minetest Game, if you use a different game or have
many mods installed you should generate a matching colors.txt for better results.
The `generate_colorstxt.py script
<./util/generate_colorstxt.py>`_ in the util folder exists for this purpose, detailed instructions can be found within.
Requirements
------------