Add pipeline tag

This PR ensures it can be found at https://huggingface.co/models?pipeline_tag=text-to-video&sort=trending

README.md

@@ -1,4 +1,6 @@
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 license: mit
+pipeline_tag: text-to-video
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+
 Model for T2V Sketch LoRA in Paper: arxiv.org/abs/2411.10818