feat(model): add bson annotation to Building struct

internal/model/building.go

@@ -12,11 +12,11 @@ import (
 
 // singleton for now
 type Building struct {
-	ID          primitive.ObjectID
-	OpeningHour time.Time
-	ClosingHour time.Time
-	Workdays    []time.Weekday
-	Rooms       []*Room
+	ID          primitive.ObjectID `bson:"_id"`
+	OpeningHour time.Time          `bson:"openingHours"`
+	ClosingHour time.Time          `bson:"closingHours"`
+	Workdays    []time.Weekday     `bson:"workDays"`
+	Rooms       []*Room            `bson:"rooms"`
 }
 
 // New creates a new building.