CODE EXAMPLE FOR HTML

create external application revit api

 <?xml version="1.0" encoding="utf-8" standalone="no"?>
    <RevitAddIns>
      <AddIn Type="Application">
        <Assembly>D:SampleAddPanelAddPanelinDebugAddPanel.dll</Assembly>
        <AddInId>604b1052-f742-4951-8576-c261d1993108</AddInId>
        <FullClassName>Walkthrough.CsAddPanel</FullClassName>
        <VendorId>NAME</VendorId>
        <VendorDescription>Your Company Information</VendorDescription>
      </AddIn>
    </RevitAddIns>