Add compliant and noncompliant examples of java/unrestricted-file-upload@v1.0

Author: karmakri

src/java/detectors/unrestricted_file_upload/UnrestrictedFileUpload.java

@@ -6,6 +6,7 @@
 package detectors.unrestricted_file_upload;
 
 import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
 import java.io.InputStream;
 import java.io.File;
 import java.util.HashMap;