Add trained model and demo video

.gitattributes

@@ -34,3 +34,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.zst filter=lfs diff=lfs merge=lfs -text
 *tfevents* filter=lfs diff=lfs merge=lfs -text
 3DBall_Demo.mp4 filter=lfs diff=lfs merge=lfs -text
+3DBall_Demo[[:space:]](online-video-cutter.com).mp4 filter=lfs diff=lfs merge=lfs -text

3DBall_Demo (online-video-cutter.com).mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:75a5b3884934705b6ecbb59e7cd9cf33a6c73f949970627ad97ed9ba0c5906a9
+size 9896503