Cordova framework with built-in ZeroNet

Reference: https://github.com/HelloZeroNet/ZeroNet/issues/1647

Start by reading the referenced ZeroNet issue #1647, since this issue provides no implementation details, files, tests, or entry points. Determine the intended Cordova integration and its acceptance criteria there before locating the relevant mobile or application code; the issue does not define what completion should look like.

索引モデルが issue の本文から書いたものです。