Enable dual-write between F&O and Dataverse

Follow Microsoft documentation to enable Dual Write for existing Finance and Operations apps. 

The setup is done in 3 steps (see below). For each step, we have added some information for clarification.

1. System requirements and prerequisites https://docs.microsoft.com/en-us/dynamics365/fin-ops-core/dev-itpro/data-entities/dual-write/requirements-and-prerequisites.
   • See Extra information on System requirements and prerequisites for more detailed information on what to do in the steps in the Microsoft documentation (System requirements and prerequisites). The steps that include extra information on are steps 2,3,4 and 7.
2. Use the dual-write wizard to link your environments. https://docs.microsoft.com/en-us/dynamics365/fin-ops-core/dev-itpro/data-entities/dual-write/link-your-environment. 
   • Go through steps 1-7.
3. Enable entity maps for dual-write (for standard MS entities). https://docs.microsoft.com/en-us/dynamics365/fin-ops-core/dev-itpro/data-entities/dual-write/enable-entity-map.
   • See Mapping details for standard entities for more detailed information on what standard entities need to be started and some pre requisites before the A365 mappings will be done.