chore: add example files (2 photos, 2 stls)

example_vault/.gitattributes

@@ -1,2 +1,4 @@
 video/** filter=lfs diff=lfs merge=lfs -text
 images/** filter=lfs diff=lfs merge=lfs -text
+3d/David_(Michelangelo).stl filter=lfs diff=lfs merge=lfs -text
+3d/Scan_the_World_-_Venus_de_Milo.stl filter=lfs diff=lfs merge=lfs -text

example_vault/ATTRIBUTION.md

@@ -1,6 +1,10 @@
 - `video/video_wide.webm` is [**Sirui 35mm Anamorphic Lens TEST FOOTAGE (pure cinematography)** by _DreamDuo Films_][video_wide]
 - `video/video_vertical.webm` is [**free footage video background | portrait background** by _CahRusli_][video_vertical]
-- `images` - `church.jpg`, `landscape.jpg`, `vertical_rocks.jpg` by *Tomáš Mládek*
+- `images` - `church.jpg`, `landscape.jpg`, `vertical_rocks.jpg` by _Tomáš Mládek_
+- `images/The_Blue_Marble.jpg` - https://commons.wikimedia.org/wiki/File:The_Blue_Marble.jpg
+- `images/The Great Wave off Kanagawa.jpg` - https://en.wikipedia.org/wiki/File:Tsunami_by_hokusai_19th_century.jpg
+- `models/David_(Michelangelo).stl` - https://commons.wikimedia.org/wiki/File:David_(Michelangelo).stl
+- `models/Scan_the_World_-_Venus_de_Milo.stl` - https://commons.wikimedia.org/wiki/File:Scan_the_World_-_Venus_de_Milo.stl
 
 [video_wide]: https://www.youtube.com/watch?v=rGVeryrPMEA
 [video_vertical]: https://www.youtube.com/shorts/QbhDvqZ50Lw