[boost] [Root Pointer] Partial documentation

The documentation is not completed yet but an updated overview, a basic tutorial and the rationale are available here: https://htmlpreview.github.io/?https://raw.githubusercontent.com/philippeb8/... https://htmlpreview.github.io/?https://raw.githubusercontent.com/philippeb8/... https://htmlpreview.github.io/?https://raw.githubusercontent.com/philippeb8/... Thanks, -Phil