Add README into tools directory

tools/README.md

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+# MineClone 2 Tools
+This directory is for tools and scripts for MineClone 2.
+Currently, the only tool is Texture Converter.
+
+## Texture Converter (EXPERIMENTAL)
+This is a Python script which converts a resource pack for Minecraft to
+a texture pack for Minetest (and thus, MineClone 2).
+
+**WARNING**: This script is currently incomplete, not all textures will be
+converted. Some texture conversions are even buggy!
+For a 100% complete texture pack, a bit of manual work will be required
+afterwards.
+
+Modes of operation:
+- Can create a Minetest texture pack (default)
+- Can update the MineClone 2 textures
+
+Requirements:
+- Know how to use the console
+- Python 3
+- ImageMagick
+
+Usage:
+- Make sure the file “`Conversion_Table.csv`” is in the same directory as the script
+- In the console, run `./Texture_Converter.py -h` to learn the available options
+