EMS-ESP32/mock-api/README.md

(Based on https://github.com/emsesp/EMS-ESP32/issues/41)

When developing and testing the web interface, it's handy not to bother with re-flashing an ESP32 each time. The idea is to mimic the ESP using a mock/stub server that responds to the REST (HTTP POST & GET) and WebSocket calls.

To set it up it do run npm install in the mock-api folder, then from the interface folder run npm run standalone. This will start the mock API server on port 3080 using data from mock-api/server.js and the web server runs on port 3000.