add diffusers docs

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     <p style="margin-bottom: 10px; font-size: 94%">
       FlagStudio aims to provide high quality AI-generated artwork. Our current bilingual model is based on the original  <a href="https://huggingface.co/CompVis/stable-diffusion" style="text-decoration: underline;">stable diffusion</a> model and is capable to generate images from both Chinese and English text. FlagStudio is developed and supported by the FlagAI team. Relevant code and model weights released in <a href="https://github.com/FlagAI-Open/FlagAI/tree/master/examples/AltDiffusion" style="text-decoration: underline;">AltDiffusion</a>.（[email protected]）
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+    <p style="margin-bottom: 10px; font-size: 94%">
+    AltDiffusion has been added to 🧨Diffusers, see the documentation page: <a href="https://huggingface.co/docs/diffusers/main/en/api/pipelines/alt_diffusion">🧨 Pipeline doc</a>         
+    </p>    
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