I would like to create Hotspot using networkmanager but after i select create a wifi network
and put network name and password i see the device does not support Ad-Hoc networks
What shoud i do 
Try using linux-wifi-hotspot. It is simple but has great options:
https://search.nixos.org/packages?channel=unstable&from=0&size=50&sort=relevance&type=packages&query=hotspot
I also created this wiki page which might help you Internet Connection Sharing - NixOS Wiki
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is this work for sharing vpn network
i would like to share it to my android box