Docs: Basic setup guide

docs/SETUP.md

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+# Dev Environment Setup Guide
+
+## Ruby on Rails Basic Setup
+
+* Get Ruby ([rbenv](https://github.com/rbenv/rbenv) or [rvm](https://rvm.io/) recommended.
+
+* Install PostgreSQL (eg. `brew install postgres` or via [PostgreSQL.org](http://www.postgresql.org/download/)).
+
+* Run `bin/setup` to setup [Bundler](http://bundler.io/), install gem dependencies and configure the databases.
+
+* Run `rake test` to execute the test suite.
+
+* Run `rails server` to begin the server at [localhost:3000](http://localhost:3000/)!
+
+* Configure your copy of Helpy in `config/settings/<your-environment>.yml`.