Add sources and compilation guide

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+## Compilation instructions
+
+Set up your MSYS2 environment using pacman to obtain native and mingw-w64-cross compilers (C,C++), mingw-w64-cross-zlib, wget, and git.  Then run the following:
+```bash
+# Set environment options to catch errors.  Please report any issues.
+set -xe
+
+# Set this variable to the path of pokeruby-tools if different.
+TOOLSDIR=$(pwd)/pokeruby-tools
+
+# Edit this variable if libpng updates or you want to use an older version of libpng.
+PNGVER=1.6.37
+
+# Clone this repository if you haven't already.
+git clone https://github.com/pret/pokeruby-tools
+
+# Clone and install agbcc if you haven't already.
+git clone https://github.com/pret/agbcc
+cd agbcc
+sh build.sh
+sh install.sh ${TOOLSDIR}
+cd ..
+
+# gbagfx and rsfont require static libpng targeting i686-w64-mingw32, so we compile it here.
+wget http://prdownloads.sourceforge.net/libpng/libpng-${PNGVER}.tar.xz
+tar -xJf libpng-${PNGVER}.tar.xz
+cd libpng-${PNGVER}
+./configure --host=i686-w64-mingw32 --prefix=${TOOLSDIR}/tools/.local
+make
+make install
+cd ..
+
+# Now build the tools.
+cd pokeruby-tools
+sh build.sh
+```