Updated readme

README.md

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+# Wii U CPU benchmark
+
+A simple homebrew application to benchmark the CPU on a Wii U. Works by running a bunch of different algorithms and then printing out the duration.
+
+#### Usage
+
+The .elf file can be run on a Wii U via Homebrew Launcher or in Cemu by launching it directly.
+
+#### How to compile
+
+1. Get DevkitPro PPC
+2. Open BenchmarkTool.pnproj in Programmer's Notepad
+3. Click Tools -> Make