Create README.md

Simple README with build instructions

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+wenboi
+======
+
+A simple Game Boy emulator
+
+Build instructions
+==================
+
+wenboi uses CMake for building and depends on Qt, so you should install
+the qt development package for your distro of choice and do this at the
+repository root:
+
+    mkdir build
+    cd build
+    cmake ..
+    make
+    
+This will build libwenboicore.a, the wenboi core library, qtboi, the
+emulator front-end, and wendi, the old wenboi disassembler. The emulator
+front-end has an integrated debugger and interactive disassembler, you
+probably want to run that one :)