Initial cloud-services repo - gateway service + pkg modules

pkg/mongo/fields.go

@@ -0,0 +1,15 @@
+package mongo
+
+import (
+	"go.mongodb.org/mongo-driver/bson"
+)
+
+func getFieldsToIgnore(fields []string) bson.M {
+	projection := bson.M{}
+
+	for _, field := range fields {
+		projection[field] = 0
+	}
+
+	return projection
+}