Add playlist name and video name in playlist sharing content

[ShareASmile]

What is it?

• Bug fix (user facing)
• Feature (user facing)
• Code base improvement (dev facing)
• Meta improvement to the project (dev facing)

Description of the changes in your PR

Add playlist name and video name in playlist sharing content

Currently, only a list of videos separated by newline are added in
the share content.
This makes it difficult to identify a specific video in a list of
Urls.
Used string resources for the sharing content formats.
Added a confirmation dialog for users to choose between sharing
playlist formats.
Added Playlist name as the header and corresponding video name for
each video Url in following format.

Testing apk

Newpipe-add-playlist-n-video-name-when-share.zip

Agreement

• I carefully read the contribution guidelines and agree to them.