Added README.

README.md

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+Minetest Mapper C++
+===================
+
+A port of minetestmapper.py to C++ from [minetest](https://github.com/celeron55/minetest/tree/master/util)
+
+Requirements
+------------
+
+* libgd
+* sqlite3
+* dirent
+* xxd binary
+
+Compilation
+-----------
+
+    git clone git://github.com/mireq/minetest-mapper-cpp.git minetest-mapper-cpp
+    cd minetest-mapper-cpp/
+    cmake .
+    make
+
+Usage
+-----
+
+Binary `minetest_mapper` has two mandatory paremeters, `-i` (input world path)
+and `-o` (output image path).
+
+    ./minetest_mapper -i /home/user/.minetest/worlds/my_world/ -o /home/user/map.png
+
+
+Parameters
+^^^^^^^^^^
+
+bgcolor:
+    Background color of image, `--bgcolor #ffffff`
+
+scalecolor:
+    Color of scale, `--scalecolor #000000`
+
+playercolor:
+    Color of player indicators, `--playercolor #ff0000`
+
+origincolor:
+    Color of origin indicator, `--origincolor #ff0000`
+
+drawscale:
+    Draw tick marks, `--drawscale`
+
+drawplayers:
+    Draw player indicators, `--drawplayers`
+
+draworigin:
+    Draw origin indicator, `--draworigin`
+
+Customization of colors.txt
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Default `colors.txt` is included in binary. Color definitions can be redefined
+using external `colors.txt` file.