openPage: Create a server
In anders-biostat/JsRCom: Exchange commands between R and JavaScript

openPage creates a server and establishes a websocket connection between it and the current R session. This allows commands exchange. In R use sendCommand function to send and execute JavaScript code on the server. On the server use jrc.sendCommand function to send and exectute R code in the current R session.

1	openPage(useViewer = T, rootDirectory = NULL, startPage = NULL)

`useViewer`	If `TRUE`, the start page will be opened in the RStudio Viewer. If `FALSE` a default web browser will be used.
`rootDirectory`	A path to the root directory of the server. If `rootDirectory` is not defined, the `http_root` in the package directory will be used as a root directory.
`startPage`	A path to the HTML file that should be opened, when the server is initialised. This can be an absolute path to a local file, or it can be relative to the `rootDirectory` or to the current R working directory. If `startPage` is not defined, this function opens an empty HTML page. The file must have .html extension.