Add part10 with passing tests

part10/README.md

@@ -0,0 +1,42 @@
+Part 9
+======
+
+## Installation
+
+```bash
+elm-package install
+```
+
+(Answer `y` when prompted.)
+
+
+## Building
+
+```bash
+elm-live Main.elm --open --pushstate --output=elm.js
+```
+
+## Running Tests
+
+Do either (or both!) of the following:
+
+#### Running tests on the command line
+
+```bash
+elm-test
+```
+
+#### Running tests in a browser
+
+```bash
+cd tests
+elm-reactor
+```
+
+Then visit [localhost:8000](http://localhost:8000) and choose `HtmlRunner.elm`.
+
+## References
+
+* [Using Elm packages](https://github.com/elm-lang/elm-package/blob/master/README.md#basic-usage)
+* [elm-test documentation](http://package.elm-lang.org/packages/elm-community/elm-test/latest)
+* [`(<|)` documentation](http://package.elm-lang.org/packages/elm-lang/core/latest/Basics#<|)