add db-wrapper package types

internal/app/db-wrapper/main.go

@@ -0,0 +1,14 @@
+package dbwrapper
+
+import "fmt"
+
+func NewWrapper(driverType string) (DbWrapper, error) {
+	switch driverType {
+	case "postgres":
+		return &postgresDbWrapper{}, nil
+	case "sqlserver":
+		return &mssqlDbWrapper{}, nil
+	default:
+		return nil, fmt.Errorf("driver not yet supported: %s", driverType)
+	}
+}