include development and installation information in README

README.md

@@ -1,2 +1,35 @@
 # Headmates
 The goal of this project is to provide for the user as she writes in a textbox multiple suggestions for the next words / phrases.
+
+# Development
+
+## Installation
+All steps should be taken from root directory of repository
+
+### Install `npm`
+Follow the instructions here: https://github.com/creationix/nvm
+Any modern version of node and npm ought to work.
+
+### Install Elm (importantly, `elm-package`)
+`npm install -g elm`
+
+### Install `elm-test`
+`npm install -g elm-test`
+
+### Install Elm dependencies
+`elm-package install`
+
+### Install `yarn`
+`npm install -g yarn`
+
+### Install `npm` dependencies
+`yarn install`
+
+## Development Environment
+After installation, normal development involves the following.
+
+### Running a local build, with webpack watching, recompilation, and auto-refresh of browser page
+`yarn start`
+
+### Running the tests in watch mode
+`elm-test --watch`