feat: login service and implement database storage

internal/utilities/utils/body_payload.go

@@ -0,0 +1,21 @@
+package utils
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+)
+
+func UnmarshalBody(r *http.Request, v any) error {
+	body, err := io.ReadAll(r.Body)
+	if err != nil {
+		return err
+	}
+
+	err = json.Unmarshal(body, v)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}