Adding MongoDB and EF (CodeFirst) relations

add CoffeePlace to Mongo ->
Get the Object Instance Id ->
assign the CoffeePlace Id to Employee ->
add Employee  to MongoDb
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Get CoffeePlaces and Employees from MongoDb
IF CoffeePlaces Id == Employees CoffeePlaceID ->
Make the EF relation
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Save CoffeePlaces data to EF with CodeFirst approach