Development mode browserlist and update readme

README.md

@@ -37,11 +37,29 @@ Pre-requisites:
 6. Install the frontend depenencies:\
   `yarn install`
 
-7. Start the Rails server:\
+7. Start the dev servers using foreman:\
+  `./bin/dev`
+
+  Or start them individually:\
+
+  a. Rails:\
     `bundle exec rails s`
 
+  b. JS (for hot reloading):\
+    `yarn build mode=development --watch`
+
+If you're not modifying front end assets you can bundle them as a one off task:\
+  `yarn build mode=development`
+
+Development mode will target the latest versions of Chrome, Firefox and Safari for transpilation while
+production mode will target older browsers.
+
 The Rails server will start on <http://localhost:3000>.
 
+Running the test suite (front end assets need to be built or server needs to be running):\
+  `bundle exec rspec`
+  
+
 ### Using Docker
 
 1. Build the image:\

package.json

@@ -33,11 +33,18 @@
   },
   "version": "0.1.0",
   "devDependencies": {},
-  "browserslist": [
+  "browserslist": {
+    "production": [
       "last 1 version",
       "> 1%",
       "IE 10"
     ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
+  },
   "babel": {
     "presets": [
       "@babel/preset-env"