Add a new section to change LLM model such as deepseek based on validated model table in LLM microservice (#1501)

Signed-off-by: Tsai, Louie <louie.tsai@intel.com>
Co-authored-by: Wang, Kai Lawrence <109344418+wangkl2@users.noreply.github.com>
Co-authored-by: xiguiw <111278656+xiguiw@users.noreply.github.com>

Author: 3 people

ChatQnA/docker_compose/intel/cpu/xeon/README.md

@@ -34,10 +34,22 @@ To set up environment variables for deploying ChatQnA services, follow these ste
    ```
 
 3. Set up other environment variables:
+
    ```bash
    source ./set_env.sh
    ```
 
+4. Change Model for LLM serving
+
+   By default, Meta-Llama-3-8B-Instruct is used for LLM serving, the default model can be changed to other validated LLM models.  
+   Please pick a [validated llm models](https://github.com/opea-project/GenAIComps/tree/main/comps/llms/src/text-generation#validated-llm-models) from the table.  
+   To change the default model defined in set_env.sh, overwrite it by exporting LLM_MODEL_ID to the new model or by modifying set_env.sh, and then repeat step 3.  
+   For example, change to Llama-2-7b-chat-hf using the following command.
+
+   ```bash
+   export LLM_MODEL_ID="meta-llama/Llama-2-7b-chat-hf"
+   ```
+
 ## Quick Start: 2.Run Docker Compose
 
 ```bash

ChatQnA/docker_compose/intel/hpu/gaudi/README.md

@@ -39,6 +39,25 @@ To set up environment variables for deploying ChatQnA services, follow these ste
    source ./set_env.sh
    ```
 
+4. Change Model for LLM serving
+
+   By default, Meta-Llama-3-8B-Instruct is used for LLM serving, the default model can be changed to other validated LLM models.  
+   Please pick a [validated llm models](https://github.com/opea-project/GenAIComps/tree/main/comps/llms/src/text-generation#validated-llm-models) from the table.  
+   To change the default model defined in set_env.sh, overwrite it by exporting LLM_MODEL_ID to the new model or by modifying set_env.sh, and then repeat step 3.  
+   For example, change to DeepSeek-R1-Distill-Qwen-32B using the following command.
+
+   ```bash
+   export LLM_MODEL_ID="deepseek-ai/DeepSeek-R1-Distill-Qwen-32B"
+   ```
+
+   Please also check [required gaudi cards for different models](https://github.com/opea-project/GenAIComps/tree/main/comps/llms/src/text-generation#system-requirements-for-llm-models) for new models.  
+   It might be necessary to increase the number of Gaudi cards for the model by exporting NUM_CARDS to the new model or by modifying set_env.sh, and then repeating step 3. For example, increase the number of Gaudi cards for DeepSeek-R1-
+   Distill-Qwen-32B using the following command:
+
+   ```bash
+   export NUM_CARDS=4
+   ```
+
 ## Quick Start: 2.Run Docker Compose
 
 ```bash