chore: add package.json.files

Author: AJ ONeal

package.json

@@ -30,7 +30,10 @@
     "url": "https://github.com/dashive/dashhd.js/issues"
   },
   "homepage": "https://github.com/dashive/dashhd.js",
-  "files": [],
+  "files": [
+      "dashhd.js",
+      "jsconfig.json"
+  ],
   "devDependencies": {
     "@dashincubator/secp256k1": "^1.7.1-4",
     "dashphrase": "^1.3.1-0",