[Docs] Please add how to use with vscode launch.json

[benwinding]

After a lot of trial and error, I finally got this working with vscode. Here's my launch.json, this would be helpful to include in the docs for others.

launch.json

{
  "version": "0.2.0",
  "configurations": [
    {
      "name": "Debug Functions",
      "request": "launch",
      "type": "node",
      "runtimeArgs": [
        "-r",
        "${workspaceFolder}/functions/node_modules/ts-node/register",
        "-r",
        "${workspaceFolder}/functions/node_modules/tsconfig-paths/register"
      ],
      "args": ["${workspaceFolder}/functions/src/index-localdev.ts"],
      "cwd": "${workspaceFolder}",
      "protocol": "inspector",
      "env": {
        "NODE_ENV": "development",
        "TS_NODE_PROJECT": "${workspaceFolder}/functions/tsconfig.json"
      },
      "outFiles": ["${workspaceFolder}/functions/lib/**/*.js"]
    },
  ]
}