message: Improve SQLite setup docs
  Adding more prominent documentation about SQLite setup that many people seem to miss regarding the `sqltools.useNodeRuntime` setting. Added a sample `settings.json`.
diff: - Node.js 6 or newer
  - Enable `sqltools.useNodeRuntime` setting, can be `true` or a path to the node runtime.
  -> Extension automatically installs SQLite driver (sqlite@v4.0.6)
  +```json
  +// settings.json example
  +{
  + "sqltools.useNodeRuntime": true
  +}
  +```
  +
  +> Extension automatically asks to install the SQLite driver (sqlite@v4.0.6)
  More information you cand find in [node-sqlite3](https://github.com/mapbox/node-sqlite3) repo: https://github.com/mapbox/node-sqlite3.
  