Add a repository short-hand.

Part of #64.

Author: jkomoros

package.json

@@ -20,6 +20,7 @@
     "bin": {
         "garden": "./tools/garden/main.js"
     },
+    "repository": "jkomoros/prompt-garden",
     "dependencies": {
         "@polymath-ai/ai": "^0.0.5",
         "eslint": "^8.43.0",