Make @glimmer/tracking an ember-cli addon for Ember apps.

packages/@glimmer/tracking/ember-addon-main.js

@@ -0,0 +1,5 @@
+'use strict';
+
+module.exports = {
+  name: '@glimmer/tracking',
+};

packages/@glimmer/tracking/package.json

@@ -2,17 +2,25 @@
   "name": "@glimmer/tracking",
   "version": "2.0.0-beta.9",
   "description": "Glimmer property tracking library",
+  "keywords": [
+    "ember-addon"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/glimmerjs/glimmer.js",
+    "directory": "packages/@glimmer/tracking"
+  },
+  "license": "MIT",
   "contributors": [
     "Dan Gebhardt <[email protected]>",
     "Tom Dale <[email protected]>"
   ],
-  "repository": "https://github.com/glimmerjs/glimmer.js",
-  "license": "MIT",
-  "files": [
-    "dist"
-  ],
   "main": "dist/commonjs/index.js",
   "module": "dist/modules/index.js",
+  "files": [
+    "dist",
+    "ember-addon-main.js"
+  ],
   "dependencies": {
     "@glimmer/env": "^0.1.7",
     "@glimmer/validator": "0.61.2"
@@ -24,6 +32,9 @@
     "@glimmer/resolver": "^0.3.0",
     "@glimmer/wire-format": "0.61.2"
   },
+  "ember-addon": {
+    "main": "ember-addon-main.js"
+  },
   "volta": {
     "node": "12.16.1",
     "yarn": "1.22.4"