Update the GMC README based on current changes. (#396)

* update the GMC README based on current changes.
Signed-off-by: zhlsunshine <huailong.zhang@intel.com>

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* change the doc based on comments.
Signed-off-by: zhlsunshine <huailong.zhang@intel.com>

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

microservices-connector/README.md

@@ -36,83 +36,64 @@ There are `2` components in this repo:
 - 1. `manager`: controller manager to handle GMC CRD
 - 2. `router`: route the traffic among the microservices defined in GMC
 
-#### How to build these binaries?
+### GMC build
+
+#### Binaries building
 
 ```sh
 make build
 ```
 
-#### How to build docker images for these 2 components?
+#### Docker images building
 
 ```sh
 make docker.build
 ```
 
-#### How to delete these components' binaries?
+#### Binaries deleting
 
 ```sh
 make clean
 ```
 
-### To Deploy on the cluster
+### GMC Deployment on K8s cluster
 
-**Build and push your image to the location specified by `CTR_IMG`:**
+**GMC Images NOTE:** This image ought to be published in [OPEA docker hub](https://hub.docker.com/u/opea), including [gmcmanager](https://hub.docker.com/r/opea/gmcmanager) and [gmcrouter](https://hub.docker.com/r/opea/gmcrouter). Make sure you have the proper permission to the registry and use the latest images.
 
-```sh
-make docker.build docker.push CTR_IMG=<some-registry>/gmcmanager:tag
-```
+There are 2 methods for deploying GMC on K8s cluster:
 
-**NOTE:** This image ought to be published in the personal registry you specified.
-And it is required to have access to pull the image from the working environment.
-Make sure you have the proper permission to the registry if the above commands don’t work.
+- Deploy via native kubectl
+- Deploy via helm chart
 
-**Install GMC CRD**
+#### Deploy using native kubectl
 
-```sh
-kubectl apply -f config/crd/bases/gmc.opea.io_gmconnectors.yaml
-```
+There are 3 steps for deploying GMC on K8s cluster as below:
 
-**Copy GMC router manifest**
+- Install GMC CRD
+- Prepare GenAI Components and GMC Router manifests
+- Deploy GMC Manager
 
-```sh
-cp $(pwd)/config/gmcrouter/gmc-router.yaml -p $(pwd)/config/manifests/
-```
+**Deploy GMC NOTE:**
 
-**NOTE:**
-before apply the manifests, please replace your own huggingface tokens in the manifests
+- Before installting the manifests, please replace your own huggingface tokens
+- `MOUNT_DIR` is the `hostPath` to save the models on you cluster hosts, so please make sure it is ready on every node of the k8s nodes and the microservices have enough permission to access it.
+- The `SYSTEM_NAMESPACE` should keep the same with the namespace defined in `gmc-manager.yaml` and `gmc-manager-rbac.yaml`
+- The configmap name `gmcyaml` is defined in gmcmanager deployment Spec. Please modify accordingly if you want
+  use a different name for the configmap
 
 ```sh
+# Install GMC CRD
+kubectl apply -f config/crd/bases/gmc.opea.io_gmconnectors.yaml
+# Prepare GenAI Components and GMC Router manifests
+cp $(pwd)/config/gmcrouter/gmc-router.yaml -p $(pwd)/config/manifests/
+export YOUR_HF_TOKEN=<your hugging facetoken>
+export MOUNT_DIR=<your model path>
 find . -name '*.yaml' -type f -exec sed -i "s#insert-your-huggingface-token-here#$YOURTOKEN#g" {} \;
-```
-
-if you have pre-defined directory to save the models on you cluster hosts, please set the path to the manifests
-
-```sh
 find . -name '*.yaml' -type f -exec sed -i "s#path: /mnt/opea-models#path: $MOUNT_DIR#g" {} \;
-```
-
-**Create Namespace for gmcmanager deployment**
-\*\*Create Namespace for gmcmanager deployment
-
-```sh
+# Deploy GMC Manager
 export SYSTEM_NAMESPACE=system
 kubectl create namespace $SYSTEM_NAMESPACE
-```
-
-**NOTE:** The `SYSTEM_NAMESPACE` should keep the same with the namespace defined in gmc-manager.yaml and gmc-manager-rbac.yaml.
-
-**Create ConfigMap for GMC to hold GenAI Components and GMC Router manifests**
-
-```sh
 kubectl create configmap gmcyaml -n $SYSTEM_NAMESPACE --from-file $(pwd)/config/manifests
-```
-
-**NOTE:** The configmap name `gmcyaml' is defined in gmcmanager deployment Spec. Please modify accordingly if you want
-use a different name for the configmap.
-
-**Install GMC manager**
-
-```sh
 kubectl apply -f $(pwd)/config/rbac/gmc-manager-rbac.yaml
 kubectl apply -f $(pwd)/config/manager/gmc-manager.yaml
 ```
@@ -125,33 +106,25 @@ NAME                              READY   STATUS    RESTARTS   AGE
 gmc-controller-78f9c748cb-ltcdv   1/1     Running   0          3m
 ```
 
-### Next Step
-
-Please refer to this [usage_guide](./usage_guide.md) for sample use cases.
-
-### To Uninstall
-
-**Delete the instances (CRs) from the cluster:**
+**To Uninstall via kubectl**
 
 ```sh
+# Delete the instances (CRs) from the cluster
 kubectl delete -k config/samples/
-```
-
-**Delete the APIs(CRDs) from the cluster:**
-
-```sh
+# Delete the APIs(CRDs) from the cluster
 make uninstall
+# UnDeploy the controller from the cluster
+make undeploy
 ```
 
-**UnDeploy the controller from the cluster:**
+#### Deploy via helm chart
 
-```sh
-make undeploy
-```
+Please refer to [helm chart README](./helm/README.md) for deploying GMC using helm chart.
 
-### Deploy using helm chart
+### Next Step
 
-Please refer to the [helm chart README](./helm/README.md) for deploying GMC using helm chart.
+Please refer to [usage_guide](./usage_guide.md) for sample use cases.
+Please refer to [advanced_use_cases](./config/samples/ChatQnA/use_cases.md) for more use cases based on ChatQnA example.
 
 ### Troubleshooting guide