Add quagga.d.ts to package.json

See https://www.typescriptlang.org/docs/handbook/declaration-files/publishing.html#including-declarations-in-your-npm-package

package.json

@@ -109,5 +109,6 @@
     "ndarray": "^1.0.18",
     "ndarray-linear-interpolate": "^1.0.0",
     "webrtc-adapter": "^2.0.2"
-  }
+  },
+  "types": "type-definitions/quagga.d.ts"
 }