mDNS discovery support

[RohitVerma882]

Feature description
Please add multicast mDNS discovery api

Reference implementation

Have you checked if the feature is accessible through the Android API?
Do you know of other open-source apps that has a similar feature as the one you want? (Provide links)

https://developer.android.com/develop/connectivity/wifi/use-nsd

https://source.android.com/docs/core/ota/modular-system/dns-resolver#mdns-local-resolution

https://github.com/vilassn/mDNS-demo