Cordova 'build failed' due to missing jxcore plugin

[thaliproject]

Cordova 'build failed' due to missing jxcore plugin

[deadlyfingers]

We should add the workaround to the readme - to download the jxcore plugin and add it manually:

jx install -g download-cli

cd postcard/thaliDontCheckIn
download https://github.com/jxcore/jxcore-cordova-release/raw/master/0.0.7/io.jxcore.node.jx
jx io.jxcore.node.jx
cordova plugins add io.jxcore.node/

cordova platform remove android
cordova platform add android
cordova build android

cordova platform remove ios
cordova platform add ios
cordova build ios

[yaronyg]

This smells like a dupe of thaliproject/Thali_CordovaPlugin#192