Adds sandbox

Author: Mike Solomon

.gitignore

@@ -8,3 +8,5 @@
 /.purs*
 /.psa*
 /.spago
+/sandbox/dist
+/output-es

package.json

@@ -4,6 +4,7 @@
   "description": "",
   "main": "index.js",
   "scripts": {
+    "sandbox": "spago -x sandbox.dhall build && vite build sandbox/",
     "format": "purs-tidy format-in-place \"src/**/*.purs\" && prettier --write \"src/**/*.js\""
   },
   "keywords": [],
@@ -12,7 +13,9 @@
   "devDependencies": {
     "prettier": "^2.8.1",
     "purescript": "^0.15.7",
+    "purs-backend-es": "^1.3.1",
     "purs-tidy": "^0.9.2",
-    "spago": "^0.20.9"
+    "spago": "^0.20.9",
+    "vite": "^4.0.4"
   }
 }