add fileentity controller

src/main/java/ru/soune/nocopy/handler/validator/FileUploadRequestValidator.java

@@ -55,12 +55,5 @@ public class FileUploadRequestValidator implements Validator {
             errors.rejectValue("extension", "extension.required", "Extension is required");
             return;
         }
-
-        if (!extension.startsWith(".")) {
-            errors.rejectValue("extension", "extension.invalid.format",
-                    "Extension must start with '.'");
-            return;
-        }
     }
-
-}
+}