1 - Install protoc v3+
brew install protobuf
2 - Install plugins
$ go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest```
3 - Create proto file
4 - Generate proto
```protoc --go_out=. --go-grpc_out=. proto/course_category.proto```
5 - Run evans
```evans -r repl```
6 - Exec:
```package pb
service CategoryService
call <func>