Add LFS tracking rules for generated media assets

Mirror the OpenVCAD internal repository gitattributes so images, videos,
and large binary assets in this docs repo are stored in Git LFS.

Made-with: Cursor

Author: mr-glt

.gitattributes

@@ -0,0 +1,20 @@
+*.png filter=lfs diff=lfs merge=lfs -text
+*.stl filter=lfs diff=lfs merge=lfs -text
+*.3mf filter=lfs diff=lfs merge=lfs -text
+*.3MF filter=lfs diff=lfs merge=lfs -text
+*.STL filter=lfs diff=lfs merge=lfs -text
+*.obj filter=lfs diff=lfs merge=lfs -text
+*.vdb filter=lfs diff=lfs merge=lfs -text
+*.VDB filter=lfs diff=lfs merge=lfs -text
+*.igs filter=lfs diff=lfs merge=lfs -text
+*.iges filter=lfs diff=lfs merge=lfs -text
+*.step filter=lfs diff=lfs merge=lfs -text
+*.stp filter=lfs diff=lfs merge=lfs -text
+*.dcm filter=lfs diff=lfs merge=lfs -text
+*.DCM filter=lfs diff=lfs merge=lfs -text
+*.icc filter=lfs diff=lfs merge=lfs -text
+*.ICC filter=lfs diff=lfs merge=lfs -text
+*.zip filter=lfs diff=lfs merge=lfs -text
+*.ZIP filter=lfs diff=lfs merge=lfs -text
+*.7z filter=lfs diff=lfs merge=lfs -text
+*.7Z filter=lfs diff=lfs merge=lfs -text