Cache storage documentation

# Feature Request

Details on advantages/disadvantages, supported platforms, etc. for the Cache API supported by browsers, etc.

## Motivation Behind Feature

Cordova has some great docs for helping when making decisions on where and how to store data but doesn't currently provide information saved about the Cache API which can be used in some cases instead of IndexedDB. Documenting this will help folks make informed decisions.

## Feature Description

Document Cache API similar to how localStorage, IndexedDb, Web SQL, etc. are documented.

www/docs/en/dev/cordova/storage/storage.md

## Alternatives or Workarounds

Various sites out there have some information about total size limits on iOS, etc. etc. but it is hard to find what applies to apps running inside Cordova/WKWebView.

Start with www/docs/en/dev/cordova/storage/storage.md and compare how localStorage, IndexedDB, and Web SQL are documented. Research Cache API support, advantages, disadvantages, and storage limits for Cordova and WKWebView. Done means the file contains a comparable Cache API section that helps readers choose a storage option.

Written by the indexing model from the issue text.