updated readme

README.md

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+# divatool
+
+A tool for that one game everyone hates but works on anyway.
+
+## Requirements
+
+Divatool is written in and uses [Python 3](https://www.python.org/downloads/).
+
+There are also several third party dependencies not provided as part of this repository,
+mostly used for the `xdudata` command. You need to have the binaries of the following tools
+either in your `$PATH` variable or in the [`tools`](./tools) folder. These tools are:
+
+* [clHCA](https://github.com/KinoMyu/FastHCADecoder)
+* acb_extract
+* usm_extract
+
+Make sure these executables are called the same way on your machine.
+
+## Usage
+
+TODO