Cross Reference: /external/flatbuffers/grpc/samples/greeter

`Name`	`Date`	`Size`
Up to higher level directory
`client.cpp`	22-Oct-2020	`2.5K`
`greeter.fbs`	22-Oct-2020	`274`
`Makefile`	22-Oct-2020	`487`
`server.cpp`	22-Oct-2020	`2.7K`