add README

README.md

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+## How to set up
+### Set up LLVM
+
+```
+$ curl -O http://llvm.org/releases/2.9/llvm-2.9.tgz
+$ tar xvzf llvm-2.9.tgz
+$ env UNIVERSAL=1 UNIVERSAL_ARCH="i386 x86_64" CC=/usr/bin/gcc CXX=/usr/bin/g++ ./configure --enable-bindings=none --enable-optimized --with-llvmgccdir=/tmp
+$ env UNIVERSAL=1 UNIVERSAL_ARCH="i386 x86_64" CC=/usr/bin/gcc CXX=/usr/bin/g++ make
+$ sudo env UNIVERSAL=1 UNIVERSAL_ARCH="i386 x86_64" CC=/usr/bin/gcc CXX=/usr/bin/g++ make install
+```
+
+Then,
+
+```
+$ cp /Library/RubyMotion/bin/llc /usr/local/bin/
+```
+
+### Set up RubyMotion
+```
+$ git clone git@github.com:lrz/RubyMotion.git
+$ cd RubyMotion
+$ git submodule init
+$ git submodule update
+$ bundle install
+```
+
+
+## How to debug on RubyMotion app
+First, comment out `[ios, sim].map ...` (line 31) in `data/Rakefile` as following:
+
+```ruby
+ 29     # remove debug symbols
+ 30     strip = File.join(PLATFORMS_DIR, '../usr/bin/strip')
+ 31     # [ios, sim].map { |x| Dir.glob(x + '/*.{a,dylib}') }.flatten.each { |x| sh("\"#{strip}\" -S \"#{x}\"") }
+```
+
+Then, build RubyMotion
+
+```
+$ rake optz_level=0
+```
+
+At last, debug on RubyMotion app
+
+```
+$ rake debug=1 no_continue=1
+```