Crude first pass at playground page

playground/src/main.ts

@@ -0,0 +1,45 @@
+import './style.css'
+import {newtLanguage} from './monarch.ts'
+
+import * as monaco from 'monaco-editor'
+
+
+monaco.languages.setMonarchTokensProvider("newt", newtLanguage);
+
+let container = document.getElementById('editor')!
+let result = document.getElementById('result')!
+const editor = monaco.editor.create(container, {
+  value: "module Main\n\n",
+  language: "newt",
+  theme: "vs",
+
+  automaticLayout: true,
+})
+
+let timeout : number | undefined
+
+function run(s: string) {
+  console.log('run', s)
+  process.argv = ['','', 'src/Main.newt']
+  files['src/Main.newt'] = s
+  result.innerHTML = ''
+  __mainExpression_0()
+}
+
+
+// We'll want to collect and put info in the monaco
+process.stdout.write = (s) => {
+  console.log('write', s)
+  let div = document.createElement('div')
+  div.className = 'log'
+  div.textContent = s
+  result.appendChild(div)
+}
+
+editor.onDidChangeModelContent((ev) => {
+  console.log('mc', ev)
+  let value = editor.getValue()
+  clearTimeout(timeout)
+  timeout = setTimeout(() => run(value), 1000)
+})
+console.log('REGISTER')