Update README with dev workflow

README.md

@@ -5,7 +5,14 @@ Exercism Exercises in Elm
 
 ## Setup
 
-Detailed installation instructions can be found at [http://elm-lang.org/install](http://elm-lang.org/install).
+The simplest way to install Elm is via Node.js/NPM.
+
+If you don't already have Node.js installed on your computer, you can download it from [the official site](https://nodejs.org/). Once you have Node.js up and running, follow these steps to install the Elm platform and elm-test.
+
+```bash
+$ npm install --global elm elm-test
+```
+
 
 ## Contributing
 
@@ -36,6 +43,15 @@ Please keep the following in mind:
 
 - Each exercise should have a test suite, an example solution, a template file for the real implementation and an `elm-package.json` file with the `elm-test` and `elm-console` dependencies. The CI build expects files to be named using the following convention. The example solution should be named `ExerciseModuleName.example`. The template file should be named `ExerciseModuleName.elm`. Test file should be named `ExerciseModuleNameTest.elm`.
 
+- The recommended workflow when working on an exercise is to first create the implementation and test files, `ExerciseModuleName.elm` and `ExerciseModuleNameTest.elm`.
+  - Test the new exercise directly by running `elm-test exercises/exercise_module_name/ExerciseModuleNameTest.elm`. 
+
+  - Once the implementation of the exercise is complete, move `ExerciseModuleName.elm` to `ExerciseModuleName.example` and create the template file.
+
+  - Make sure everything is good to go by running all tests with `bin/build.sh`.
+
+- Please do not commit any Elm configuration files or directories inside the exercise, such as `elm-stuff`. Please include only the standard `elm-package.json`.
+
 - Test files should use the following format:
 
 ```elm