Add Test info to README

Author: BrandonRomano

README.md

@@ -66,8 +66,9 @@ A module looks something like this:
 │   └── WreckerClass.sh
 |   └── ...
 └── lib
-    └── wrecker_library_file.sh
-    └── ...
+|   └── wrecker_library_file.sh
+|   └── ...
+└── test.sh
 ```
 
 > Feel free to add any folders or files you want to this -- this is simply the base structure that Ash uses.  You can't break anything by adding new folders or files.  You'll see I've even done this myself in [ash-make](https://github.com/ash-shell/ash-make).
@@ -83,6 +84,7 @@ name: Wrecker
 package: github.com/ash-shell/wrecker
 default_alias: wrecker
 callable_prefix: Wrecker
+test_prefix: Wrecker
 ```
 
 **`name`**: This is the human readable name of your module.  This value is used by other modules who might want to output the name of the current module.  This field is **required**.
@@ -93,6 +95,8 @@ callable_prefix: Wrecker
 
 **`callable_prefix`**: This field specifies the function prefix that Ash looks for in the callable file when calling upon a module (more detail in [the section below](#callable-modules)).  This field is only required for modules that provide a callable file.
 
+**`test_prefix`**: This field specifies the function prefix that [Test](https://github.com/ash-shell/test) looks for in the `test.sh` file when running tests.  This field is only required when you want to add tests to your module.
+
 #### callable.sh
 
 This file is only required if you want your library to be callable.  The contents of this file are explained in [this section](#callable-modules).
@@ -119,6 +123,12 @@ You can nest folders inside of `lib` for structure, but you'll need to manage im
 
 Files in the `lib` directory are auto loaded for you in the callable portions of your module, so you don't have to import your own module.
 
+#### test.sh
+
+This is the file in which you can write unit tests for your modules.
+
+The README of [ash-shell/test](https://github.com/ash-shell/test) goes into full detail of how this all works.
+
 ## Callable Modules
 
 You can build your module to be directly callable from the command line.