Add devcontainer configuration for macOS Big Sur

{

  "name": "macOS 11 (Big Sur)",

  "service": "macos",

  "containerEnv": {

    "VERSION": "11",

    "RAM_SIZE": "max",

    "DISK_SIZE": "max",

    "CPU_CORES": "max"    

  },  

  "forwardPorts": [8006],  

  "portsAttributes": {

    "8006": {

      "label": "Web",

      "onAutoForward": "openBrowser"

    }

  },

  "otherPortsAttributes": {

    "onAutoForward": "silent"

  }, 

  "hostRequirements": {

    "storage": "64gb"

  },  

  "dockerComposeFile": "../codespaces.yml"

}