Add a basic readme.

README.md

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+# luatools
+
+In progress and incredibly incomplete package for cross-format LuaTeX
+Lua-based helper functions. Roughly half of the features don't work at
+all, and the other half are buggy and slow, so don't use this yet.
+
+This will be finished eventually, at which point it will be released to
+CTAN (probably under a different name though). Until then, there's
+nothing to see here.
+
+
+## License
+
+Don't use this yet. At some point, this will be finished and will have a
+free license, but if you _really_ want to use it now, then email me.