Add Makefile build

Makefile

cmd/rdpgw/api/token.go

cmd/rdpgw/api/web.go

cmd/rdpgw/common/remote.go

cmd/rdpgw/config/configuration.go

cmd/rdpgw/main.go

cmd/rdpgw/protocol/client.go

cmd/rdpgw/protocol/common.go

cmd/rdpgw/protocol/gateway.go

cmd/rdpgw/protocol/protocol_test.go

cmd/rdpgw/protocol/server.go

cmd/rdpgw/protocol/types.go

cmd/rdpgw/protocol/utf16.go

cmd/rdpgw/security/jwt.go

cmd/rdpgw/transport/legacy.go

cmd/rdpgw/transport/transport.go

cmd/rdpgw/transport/websocket.go