Create devcontainer.json

[youminghang]

[youminghang]

nice

[cubxxw]

I believe that devcontainer.json is a fantastic tool that can help us quickly understand and learn about IM, aligning with the container development model of the cloud-native era. However, I think it would be beneficial for us to consider incorporating the use of Docker Compose or Dockerfile within devcontainer.json to swiftly build middleware environments. I am confident that this is achievable and would greatly enhance our development process.