Add package.json scripts

Author: gibson042

package.json

@@ -3,9 +3,11 @@
   "name": "template-for-proposals",
   "description": "A repository template for ECMAScript proposals.",
   "scripts": {
-    "start": "npm run build-loose -- --watch",
     "build": "npm run build-loose -- --strict",
-    "build-loose": "node -e 'fs.mkdirSync(\"build\", { recursive: true })' && ecmarkup --load-biblio @tc39/ecma262-biblio --verbose spec.emu build/index.html --lint-spec"
+    "build-loose": "node -e 'fs.mkdirSync(\"build\", { recursive: true })' && ecmarkup --load-biblio @tc39/ecma262-biblio --verbose spec.emu build/index.html --lint-spec",
+    "clean": "rm -rf out",
+    "format": "emu-format --write spec.emu",
+    "watch": "npm run build-loose -- --watch"
   },
   "homepage": "https://github.com/tc39/template-for-proposals#readme",
   "repository": {