add eval libreoffice writer compare image & centering & check file existence

evaluation_examples/examples/libreoffice_writer/4bcb1253-a636-4df4-8cb0-a35c04dfef31.json

@@ -3,10 +3,32 @@
   "snapshot": "libreoffice_writer",
   "instruction": "Export the current document into PDF, keep the file name",
   "source": "https://www.libreofficehelp.com/save-export-writer-documents-in-pdf-epub-format/",
-  "config": [],
+  "config": [
+    {
+      "type": "download",
+      "parameters": {
+        "files": [
+          {
+            "url": "https://drive.google.com/uc?export=download&id=15OtwtRFSdgyHokESupem6dBvtPeiWyKoZ7Pk5pmdzQc",
+            "path": "Desktop/Save_Writer_PDF.docx"
+          }
+        ]
+      }
+    },
+    {
+      "type": "open",
+      "parameters": {
+        "path": "Desktop/Save_Writer_PDF.docx"
+      }
+    }
+  ],
   "trajectory": "trajectories/",
   "related_apps": [
     "libreoffice_writer"
   ],
-  "evaluator": "evaluation_dir"
-}
+  "evaluator": {
+    "func": "check_file_exists",
+    "file_name": "Save_Writer_PDF.pdf",
+    "directory": "/home/user/Downloads/"
+  }
+}