Update Readme to contain required Go lang version and how to build project
# hedera-sdk-go
+### Dependencies
+Go lang version 1.13
+
+### Building
+First [build the protobufs](#Rebuilding the Protobufs)
+```
+go build
+```
+
### Rebuilding the Protobufs
`protoc --go_out=plugins=grpc:./hedera_proto -I ./vendor/hedera-protobuf/src/main/proto ./vendor/hedera-protobuf/src/main/proto/*.proto`
