Add tvlt_architecture

It is a request from PR for adding TVLT here:
https://github.com/huggingface/transformers/pull/20725/files

.gitattributes

@@ -236,3 +236,4 @@ autotrain-image-classification.png filter=lfs diff=lfs merge=lfs -text
 transformers/model_doc/lilt_architecture.jpg filter=lfs diff=lfs merge=lfs -text
 hub/spaces-gpu-settings-dark.png filter=lfs diff=lfs merge=lfs -text
 blog/123_clipseg-zero-shot/a0ca3accab5a40547f16b2abc05edd4558818bdf.png filter=lfs diff=lfs merge=lfs -text
+tvlt_architecture.png filter=lfs diff=lfs merge=lfs -text