make it easy to install as a plugin

Reason for the change:
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It was hard to install this plugin. Users have to modify their xcode project.

Changes:
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Checked in ConnectSDK and GoogleCast framework, updated plugins.xml

Results:
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Install as a normal plugin:
cordova plugins add https://github.com/ConnectSDK/Connect-SDK-Cordova-Plugin.git#master
That is it!

NOTE:
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Please update the REAME after merging.