1.-brief title: Whatsapp button in 'email this document' menu {right upper corner}}

2.-description of desired feature: when using windows desktop platforms, and once whatsapp has been logged in, a button activates to perform the operation 'send to whatsapp this pdf'
3.-why the feature is needed: it is a tool for desktop users that interacts in whatsapp informal chat groups where coordinations are made along the chat, and where 'documented environment' starts to approach 'chatting environment'