Add plugin

[ravipandit14]

issue: Cordova plugin not found
ionic cordova plugin add cordova-plugin-twilio-video

cordova.cmd plugin add cordova-plugin-twilio-video
npm: Command failed with exit code 1 Error output:
npm ERR! code E404
npm ERR! 404 Not found : cordova-plugin-twilio-video
npm ERR! 404
npm ERR! 404 'cordova-plugin-twilio-video' is not in the npm registry.
npm ERR! 404 You should bug the author to publish it (or use the name yourself!)
npm ERR! 404
npm ERR! 404 Note that you can also install from a
npm ERR! 404 tarball, folder, http url, or git url.

npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\devravi\AppData\Roaming\npm-cache_logs\2020-07-06T17_03_09_515Z-debug.log
[ERROR] An error occurred while running subprocess cordova.

    cordova.cmd plugin add cordova-plugin-twilio-video exited with exit code 1.

    Re-running this command with the --verbose flag may provide more information.