[example] upload auto parallel gpt2 demo (#2354)

examples/language/gpt/experiments/auto_parallel/README.md

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+# Auto-Parallelism with GPT2
+
+## Requirements
+
+Before you can launch training, you need to install the following requirements.
+
+### Install PyTorch
+
+```bash
+#conda
+conda install pytorch==1.12.0 torchvision==0.13.0 torchaudio==0.12.0 cudatoolkit=11.3 -c pytorch
+#pip
+pip install torch==1.12.0+cu113 torchvision==0.13.0+cu113 torchaudio==0.12.0 --extra-index-url https://download.pytorch.org/whl/cu113
+```
+
+### Install [Colossal-AI v0.2.0](https://colossalai.org/download/) From Official Website
+
+```bash
+pip install colossalai==0.2.0+torch1.12cu11.3 -f https://release.colossalai.org
+```
+
+### Install transformers
+
+```bash
+pip install transformers
+```
+
+### Install pulp and coin-or-cbc
+
+```bash
+pip install pulp
+conda install -c conda-forge coin-or-cbc
+```
+
+## Dataset
+
+For simplicity, the input data is randonly generated here.
+
+## Training
+
+```bash
+#Run the auto parallel resnet example with 4 GPUs with a dummy dataset.
+colossalai run --nproc_per_node 4 auto_parallel_with_gpt.py
+```