added tns --help in the console (#3220)

Author: dean-huczok

README.md

@@ -115,7 +115,7 @@ Quick Start
 
 ## The Commands
 
-Run `tns help` to view all available commands in the browser. Run `tns help <Command>` to view more information about a selected command in the browser.
+Run `tns help` to view all available commands in the browser. Run `tns help <Command>` to view more information about a selected command in the browser. `tns --help` opens console help, where help information is shown in the console.
 
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