init English docs

docs/en/advanced_tutorials/index.rst

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+高阶使用
+================================
+
+.. toctree::
+   :maxdepth: 1
+
+   image_augmentation/index
+   distillation/index
+

docs/en/application/index.rst

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+应用拓展
+================================
+
+.. toctree::
+   :maxdepth: 2
+   
+   transfer_learning.md
+   object_detection.md

docs/en/extension/index.rst

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+实用工具
+================================
+
+.. toctree::
+   :maxdepth: 1
+   
+   paddle_inference.md
+   paddle_mobile_inference.md
+   paddle_quantization.md
+   multi_machine_training.md
+   paddle_hub.md
+   paddle_serving.md

docs/en/models/index.rst

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+模型库
+================================
+
+.. toctree::
+   :maxdepth: 1
+   
+   models_intro.md
+   Tricks.md
+   ResNet_and_vd.md
+   Mobile.md
+   SEResNext_and_Res2Net.md
+   Inception.md
+   HRNet.md
+   DPN_DenseNet.md
+   EfficientNet_and_ResNeXt101_wsl.md
+   Others.md

docs/en/tutorials/index.rst

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+初级使用
+================================
+
+.. toctree::
+   :maxdepth: 1
+   
+   install.md
+   getting_started.md
+   config.md