Check-in a handeful of configuration files

.prettierrc

@@ -0,0 +1,4 @@
+{
+  "semi": false,
+  "singleQuote": true
+}

.tool-versions

@@ -0,0 +1 @@
+ruby 2.5.1

app/javascript/packs/hello_react.jsx

@@ -6,9 +6,7 @@ import React from 'react'
 import ReactDOM from 'react-dom'
 import PropTypes from 'prop-types'
 
-const Hello = props => (
-  <div>Hello {props.name}!</div>
-)
+const Hello = props => <div>Hello {props.name}!</div>
 
 Hello.defaultProps = {
   name: 'David'
@@ -21,6 +19,6 @@ Hello.propTypes = {
 document.addEventListener('DOMContentLoaded', () => {
   ReactDOM.render(
     <Hello name="React" />,
-    document.body.appendChild(document.createElement('div')),
+    document.body.appendChild(document.createElement('div'))
   )
 })

db/schema.rb

@@ -0,0 +1,18 @@
+# This file is auto-generated from the current state of the database. Instead
+# of editing this file, please use the migrations feature of Active Record to
+# incrementally modify your database, and then regenerate this schema definition.
+#
+# Note that this schema.rb definition is the authoritative source for your
+# database schema. If you need to create the application database on another
+# system, you should be using db:schema:load, not running all the migrations
+# from scratch. The latter is a flawed and unsustainable approach (the more migrations
+# you'll amass, the slower it'll run and the greater likelihood for issues).
+#
+# It's strongly recommended that you check this file into your version control system.
+
+ActiveRecord::Schema.define(version: 0) do
+
+  # These are extensions that must be enabled in order to support this database
+  enable_extension "plpgsql"
+
+end