feat: update welcome text

app.py

@@ -1,7 +1,6 @@
 import json
 from dataclasses import dataclass
 from io import StringIO
-from pathlib import Path
 from typing import Literal, Optional, TypedDict, cast
 from zipfile import ZipFile
 
@@ -240,7 +239,9 @@ def Page():
             )
 
     if load_result.not_called:
-        solara.Text("Drop and drag an alphafold3 result .zip file to get started")
+        solara.Markdown(
+            "Drag and drop an alphafold3 result .zip file to get started. You can download an example file [here](https://www.gstatic.com/alphafoldserver/examplefold_pdb_8aw3/examplefold_pdb_8aw3.zip)."
+        )
     elif load_result.pending:
         solara.ProgressLinear(load_result.pending)
     elif load_result.finished: