Create test suite documentation

Author: stevenbenner

test/README.md

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+# Testing PowerTip
+
+This project has an extensive test suite powered by [QUnit][qunit] and an interactive test page for testing a few quirky scenarios.
+
+[qunit]: https://qunitjs.com/
+
+## Running the test suite via the command line
+
+The command line test suite is the preferred method of testing. It has the most comprehensive set of tests, and includes code linting.
+
+ * All commands should be run from the project's root directory (where the `package.json` file is).
+ * The test automation is run with [Node.js][nodejs]. So you must have that installed before you can use the command line tools.
+
+[nodejs]: https://nodejs.org/
+
+Install the necessary npm dependencies with the following command (this only needs to be done once):
+
+```shell
+npm install
+```
+
+After that you can run the test suite with the following command:
+
+```shell
+npm run test
+```
+
+## Running the test suite in a web browser
+
+You can also run the main test suite directly in a web browser. This is particularly useful for testing a specific browser. Simply open the `index.html` file in a browser and the test suite will immediately begin the testing process.
+
+## Running the edge case tests
+
+The edge cases test page includes a number of tests that cover scenarios which are either difficult or impossible to automate. So that set of tests can only be done with human interaction. It also includes a helpful status window for debugging.
+
+You can perform those tests by opening `edge-cases.html` in a web browser. Each test case includes instructions on how to verify correct functionality.