Revise README for clarity and updated links

Updated description and added links for more information.

v1.42

Add "new DXCC", improve reading of key cmds

1.41

Use default UDP settings, changed to unicast. Add testVer. Drop deleting lotw_users,csv,

build 1.40

1.32

1.32

Merge branch 'main' of https://github.com/avantol/Tilly