Adds tools.go to pin protoc-gen-go, updates go.mod/go.sum with
google.golang.org/protobuf, generates request.pb.go and response.pb.go,
and adds a make proto target to server/Makefile for regen.
Import source files from ratel-online organization repos into monorepo
structure for gomoku game development. Update README with project
structure and credits for original authors.