add js package skeleton

js/package.json

@@ -0,0 +1,12 @@
+{
+  "name": "pmtiles",
+  "version": "0.0.2",
+  "description": "PMTiles archive decoder for browsers",
+  "main": "pmtiles.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "homepage": "https://github.com/protomaps/pmtiles",
+  "author": "Brandon Liu",
+  "license": "BSD-3-Clause"
+}

js/pmtiles.js

@@ -0,0 +1,11 @@
+(function (root, factory) {
+    if (typeof define === 'function' && define.amd) {
+        define([], factory);
+    } else if (typeof module === 'object' && module.exports) {
+        module.exports = factory();
+    } else {
+        root.pmtiles = factory();
+  }
+}(typeof self !== 'undefined' ? self : this, function () {
+    return {pmtiles:true};
+}));