.NET stack with gRPC (without cert)

This version includes gRPC-dotnet without certs, and it worked on Vagrant, but not actually working with .devcontainer (Debian), and Azure VM (Ubuntu 20). Three solutions can be chosen:

1. Generate certs and assign them to the gRPC service (product-api) => will try another simple repo for this approach
2. Using h2c protocol (gRPC - http) on Traefik

• See the solved problem with dynamic config and docker-compose: traefik/traefik#6968. But I cannot find any clue on the working version

3. Refactor it back to REST => will do

Don't use this release for any production environment. It is only for experiments.