Add end-user documentation: connecting to Office 365

• Office 365 services in the CLI
• connecting to O365 services
  • configuring proxy: https://github.com/request/request#controlling-proxy-behaviour-using-environment-variables
• persisting connections (general overview with a detailed link to concepts)
• checking connection status
• disconnecting from O365