add missing files

README.md

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+# minetest-toolranks
+Minetest tool ranks mod
+
+Tool gains levels for digging nodes. Higher level tools take longer to
+wear out.
+
+## Are you a mod developer?
+Does one of your mods add new tools?
+If so, to support this mod, check if it is loaded with
+```minetest.get_modpath("toolranks")```
+and then replace all after_use definitions with toolranks.new_afteruse.
+Optionaly, you can also replace tools description with
+```toolranks.create_description("Tool Name", 0, 1)```
+and then set original_description to your tools name.
+
+### This is a fork
+Yep, this is a simplified version of toolranks with lesser dependencies.

mod.conf

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+name = toolranks