rewrite readme and install; init.sh for install

init.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+# install rgbds
+git clone git://github.com/bentley/rgbds.git && \
+cd rgbds && \
+make && \
+sudo make install && \
+cd .. && \
+rm -rf rgbds
+
+# set up the submodule (extras/)
+git submodule init && \
+git submodule update && \
+sudo easy_install pip && \
+pip install -r extras/requirements.txt
+
+# diff binary files using hexdump
+git config diff.hex.textconv "hexdump -C"
+