Add Android sample

[shalva97]

It would be nice to have a repo, clone it, run it and see it work

[SteveWorkshop]

It would be nice to have a repo, clone it, run it and see it work

Have you succeed in importing it to your project? I'm facing some problems...

[Rattlyy]

https://github.com/Rattlyy/LLaMAndroid

[bernardladenthin]

I noticed the repository hasn't seen recent activity, so I've taken the liberty of forking it and continuing development at: https://github.com/bernardladenthin/java-llama.cpp

See also #125