gRPC Calculator example

[Sanchayan Maity]

Hi,

We had used the calculator and work leave examples during gRPC hackathon.
https://github.com/fosscafe/gRPC-examples

A rust version of the calculator example is available below
https://github.com/rustox/grpc-calculator-example

The above example uses the gRPC library from the pingcap guys
https://github.com/pingcap/grpc-rs

Regards,
Sanchayan.