docs: how to enable nvidia gpu 2.0 in Pouch

Signed-off-by: codejuan <xh@decbug.com>

docs/features/pouch_with_gpu.md

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+# PouchContainer with GPU
+
+## nvidia gpu runtime
+
+![pouch_with_pouch](../static_files/pouch_with_gpu.png)
+
+The figure shows how the libnvidia-container integrates into Pouch, specifically at the runc layer. We use a custom OCI prestart hook called nvidia-container-runtime-hook to runc in order to enable GPU containers.
+
+## Prerequisites Installation
+
+Make sure you have installed the NVIDIA driver
+
+1. GNU/Linux x86_64 with kernel version > 3.10
+2. NVIDIA GPU with Architecture > Fermi (2.1)
+3. NVIDIA drivers ~= 361.93 (untested on older versions)
+
+## Start GPU container
+
+Pouch support 2 method to start GPU container
+
+1. Via nvidia config API, [nvidiaconfig](https://github.com/alibaba/pouch/blob/master/docs/api/HTTP_API.md#nvidiaconfig)
+2. Via Environment, [nvidia-container-runtime-env](https://github.com/NVIDIA/nvidia-container-runtime#environment-variables-oci-spec)
+
+### Via API
+
+```shell
+pouch run -d --nvidia-capabilities=all --nvidia-visible-devs=all centos:7 bash
+```
+
+### Via Environment
+
+The NVIDIA Container Runtime uses environment variables in container images to specify a GPU accelerated container.
+
+```shell
+pouch run -it -e NVIDIA_VISIBLE_DEVICES=all -e NVIDIA_DRIVER_CAPABILITIES=all centos:7 bash
+```