User can update an existing application that does not have a left side bar and add a new empty one using this function.
create_left_sidebar(location)path of the existing periscope2 application
no return value, creates left sidebar related UI R file and updates related source call in ui.R
If conversion is successful, the following message will be returned "Add left sidebar conversion was successful. File(s) updated: ui.R, ui_left_sidebar.R"
If the function called on an application with an existing left bar, message "Left sidebar already available, no conversion needed" will be returned with no conversion
If the passed location is invalid, empty, not exist or not a valid periscope2 application, nothing will be added and a related error message will be printed in console