Bash setup info

SETUP.md

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+# Welcome to Bash!
+
+Unlike many other languages here, bash is a bit of a special snowflake.
+If you are on a Mac or other unix-y platform, you almost definitely
+already have bash. In fact, anything you type into the terminal is
+likely going through bash.
+
+The downside to this is that there isn't much of a development
+ecosystem around bash like there is for other languages, and there are
+multiple verions of bash that can be frustratingly incompatible. Luckily
+we shouldn't hit those differences for these basic examples, and if you
+can get the tests to pass on your machine, we are doing great.
+
+## Installation
+
+As I said above, if you are on a unix-like OS (Mac OS X, Linux, Solaris,
+etc), you probably already have bash.
+
+## Testing
+
+As there isn't much of a bash ecosystem, there also isn't really a de
+facto leader in the bash testing area. For these examples we are using
+[bats](https://github.com/sstephenson/bats). You should be able to
+install it from your favorite package manager, on OS X with homebrew
+this would look something like this:
+
+```
+$ brew install bats
+==> Downloading
+https://github.com/sstephenson/bats/archive/v0.4.0.tar.gz
+==> Downloading from
+https://codeload.github.com/sstephenson/bats/tar.gz/v0.4.0
+########################################################################
+100.0%
+==> ./install.sh /opt/boxen/homebrew/Cellar/bats/0.4.0
+🍺  /opt/boxen/homebrew/Cellar/bats/0.4.0: 10 files, 60K, built in 2
+seconds
+```
+
+Run the tests with `bats whatever_test.sh`.