I'm not sure what you are referring to when you say groundnuts. Is that a particular type of nut or just nuts in general, like peanuts?
Either way, if they are a form of nut, it should be very easy to make chocolate covered groundnuts.
All you have to do is choose some chocolate for melting. It can be a chocolate bar cut up into pieces, chocolate chips, chocolate melts, or whatever you have available in your area.
If you need to order some chocolate for melting, the wafers at Candyland Crafts work great.
Put the chocolate in the top of a double boiler. If you don't have a double boiler, you can use a bowl that will sit snugly on top of a pot without touching the simmering water in the pot.
Heat the water on low and stir the chocolate while it is melting until it is nice and smooth. Key things to remember:
Don't overheat the chocolate when melting.
Don't get any steam or moisture in the chocolate.
Once the chocolate is melted, remove it from the heat and either dip the nuts into the chocolate or put all of the groundnuts into the chocolate and stir until completely coated.
Using a spoon, scoop out the chocolate covered groundnuts and place on a piece of waxed paper or greaseproof paper until they set.
Store them chocolate coated groundnuts in an airtight container.
Hope that was what you were needing to know. Have fun!