Update README.md

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etc/sandstorm/README.md

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-To build:
-
-1) Setup environment for building as described in https://github.com/sandstorm-io/sandstorm-rawapi-example.
-	You don't need clang, you have to use g++ instead. Build CnP from github, but Sandstorm stable is fine.
-2) Follow any necessary steps from the draw.io main build README required to ensure the build is stable
-3) Create a ChangeLog entry with a version number and a timestamp
-4) Commit all changes and tag both the drawio and mxgraph2 modules using drawiosandstorm-m_n_r_b
-5) Execute build.sh in this directory to the package
-6) In the build directory invoke 'spk publish package.spk' to submit for publishing
+-Get the draw.io project from github
+-Navigate to drawio/etc/sandstorm
+-Create a directory named build
+-Install vagrant-spk https://docs.sandstorm.io/en/latest/vagrant-spk/installation/
+-cd build
+-vagrant-spk setupvm diy
+-vagrant-spk vm up
+-Invoke ../stage.sh to stage the build files. gfind is gnu find on OS X.
+-Log into the vagrant box vagrant-spk vm ssh
+-sudo apt-get install g++
+-Install latest capnp https://capnproto.org/install.html
+-In the build directory vagrant-spk dev