docs: add the user guide doc Running Occlum with rune

Signed-off-by: NYilin Li <YiLin.Li@linux.alibaba.com>
Signed-off-by: Jia Zhang <zhang.jia@linux.alibaba.com>

README.md

@@ -44,7 +44,7 @@ In addition, you can write your own enclave runtime with any programming languag
 
 ## Using rune
 ### Run Occlum
-Please refer to [this guide](https://github.com/occlum/occlum/blob/master/docs/rune_quick_start.md) to run `Occlum` with `rune`.
+Please refer to [this guide](https://github.com/alibaba/inclavare-containers/blob/master/docs/running_occlum_with_rune.md) to run `Occlum` with `rune`.
 
 ### Run Docker
 Please refer to [this guide](https://github.com/alibaba/inclavare-containers/blob/master/docs/running_rune_with_docker.md) to run `Docker` with `rune`.

docs/running_occlum_with_rune.md

+# Hardware requirements
+- Install [Intel SGX driver for Linux](https://github.com/intel/linux-sgx-driver#build-and-install-the-intelr-sgx-driver), required by Intel SGX SDK && PSW.
+- Install [enable_rdfsbase kernel module](https://github.com/occlum/enable_rdfsbase#how-to-build), allowing to use `rdfsbase` -family instructions in Occlum.
+
+---
+
+# Build and install rune
+`rune` is a CLI tool for spawning and running enclaves in containers according to the OCI specification.
+
+Please refer to [this guide](https://github.com/alibaba/inclavare-containers#rune) to build `rune` from scratch.
+
+---
+
+# Build Occlum application bundle
+## Download occlum sdk image
+``` shell
+yum install -y libseccomp-devel
+mkdir "$HOME/rune_workdir"
+docker pull occlum/occlum:0.11.0-centos7.2
+docker run -it --device /dev/isgx \
+  -v $HOME/rune_workdir:/root/rune_workdir \
+  occlum/occlum:0.11.0-centos7.2
+```
+
+You can then build a hello world demo program or your product codes in this [occlum sdk container environment](https://hub.docker.com/layers/occlum/occlum/0.11.0-centos7.2/images/sha256-9c27eefe5df9db6a63ade1f722ff62c107ff119c1b17cbbf4df75f238b4b2054?context=explore).
+
+[This guide](https://github.com/occlum/occlum#hello-occlum) can help you to create your first occlum build.
+
+## Prepare the materials
+After your occlum build, execute the following commands in occlum sdk container environment:
+
+``` shell
+cp -a .occlum /root/rune_workdir
+cd /root/rune_workdir
+mkdir lib
+cp /usr/lib64/libseccomp.so.2 lib
+cp /usr/lib64/libprotobuf.so.8 lib
+cp /usr/lib64/libsgx_u*.so* lib
+cp /usr/lib64/libsgx_enclave_common.so.1 lib
+cp /usr/lib64/libsgx_launch.so.1 lib
+```
+
+## Build occlum application image
+Now you can build your occlum application image in the `$HOME/rune_workdir` directory of your host system.
+
+Type the following commands to create a `Dockerfile`:
+``` Dockerfile
+cat >Dockerfile <<EOF
+FROM centos:7.2.1511
+
+RUN mkdir -p /run/rune/.occlum
+WORKDIR /run/rune
+
+COPY lib /lib 
+COPY .occlum .occlum
+
+RUN ln -sfn .occlum/build/lib/libocclum-pal.so liberpal-occlum.so
+RUN ldconfig
+
+ENTRYPOINT ["/bin/hello_world"]
+EOF
+```
+
+and then build it with the command:
+```shell
+docker build . -t occlum-app
+```
+
+## Create bundle
+In order to use `rune` you must have your container in the format of an OCI bundle. If you have Docker installed you can use its `export` method to acquire a root filesystem from an existing Docker container.
+
+``` shell
+# create the top most bundle directory
+cd "$HOME/rune_workdir"
+mkdir rune-container
+cd rune-container
+
+# create the rootfs directory
+mkdir rootfs
+
+# export occlum-app via Docker into the rootfs directory
+docker export $(docker create occlum-app) | sudo tar -C rootfs -xvf -
+```
+
+After a root filesystem is populated you just generate a spec in the format of a config.json file inside your bundle. `rune` provides a spec command which is similar to `runc` to generate a template file that you are then able to edit.
+
+``` shell
+rune spec
+```
+
+To find features and documentation for fields in the spec please refer to the [specs](https://github.com/opencontainers/runtime-spec) repository.
+
+In order to run the hello world demo program in Occlum with `rune`, you need to change the entrypoint from `sh` to `/bin/hello_world`
+``` json
+  "process": {
+      "args": [
+          "/bin/hello_world"
+      ],
+  }
+```
+
+and then configure enclave runtime as following:
+``` json
+  "annotations": {
+      "enclave.type": "intelSgx",
+      "enclave.runtime.path": "/run/rune/liberpal-occlum.so",
+      "enclave.runtime.args": ".occlum"
+  }
+```
+
+---
+
+# Run Occlum application
+Assuming you have an OCI bundle from the previous step you can execute the container in this way.
+
+``` shell
+cd "$HOME/rune_workdir/rune-container"
+sudo rune run rune-container
+```