documentation for redirect (#173)

* documentation for redirect

* fix location of command

* relitive > relative

README.md

@@ -400,6 +400,7 @@ Optional properties include
  - **button** - if supplied with a `name` and `icon` property - adds a button to provide user input - sends
  a msg `{"action":"button", "name":"the_button_name"}` to the worldmap in node. If supplied with a `name` property only, it will remove the button. Optional `position` property can be 'bottomright', 'bottomleft', 'topleft' or 'topright' (default).
  - **contextmenu** - html string to define the right click menu when not on a marker. Defaults to the simple add marker input. Empty string `""` disables this right click.
+ - **redirect** - Redirects user to a url of your choice. `{"command":{ "redirect": "https://nodered.org/" }}` can be a relative or absolute URL.
 
 #### To switch layer, move map and zoom