Adding README.md for babyllama example

Signed-off-by: Shrinath Suresh <shrinath@ideas2it.com>

cpp/src/examples/babyllama/README.md

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+This example is adapted from https://github.com/karpathy/llama2.c 
+
+### Setup
+
+1. Follow the instructions from [README.md](../../../README.md) to build the cpp backend
+2. Download the model and tokenizer using the following command
+
+```
+wget https://huggingface.co/karpathy/tinyllamas/resolve/main/stories15M.bin
+```
+Download the [tokenizer.bin](https://github.com/karpathy/llama2.c/blob/master/tokenizer.bin) file from the [llama2.c](https://github.com/karpathy/llama2.c) repo
+
+3. Update [config.json](config.json) with the path of the downloaded model and tokenizer.
+
+For example
+
+```
+{
+"checkpoint_path" : "/home/ubuntu/serve/cpp/stories15M.bin",
+"tokenizer_path" : "/home/ubuntu/serve/cpp/src/examples/babyllama/tokenizer.bin"
+}
+```
+
+4. Run the build
+
+```
+cd serve/cpp
+./builld.sh
+```
+
+Once the build is completed, `libbabyllama_handler.so` file is generated in the [babyllama_handler](../../../test/resources/torchscript_model/babyllama/babyllama_handler) folder
+
+### Generate MAR file
+
+Move to [babyllama_handler](../../../test/resources/torchscript_model/babyllama/babyllama_handler) folder and run the following command to generate mar file
+
+```
+torch-model-archiver --model-name llm --version 1.0 --serialized-file dummy.pt --handler libbabyllama_handler:BabyLlamaHandler --runtime LSP --extra-files config.json
+```
+
+Create model store directory and move the mar file
+
+```
+mkdir model_store
+mv llm.mar model_store/llm.mar
+```
+
+### Inference
+
+Start torchserve using the following command
+
+```
+torchserve --start --ncs --ts-config config.properties --model-store model_store/
+```
+
+Register the model using the following command
+
+```
+curl -v -X POST "http://localhost:8081/models?initial_workers=1&url=llm.mar&batch_size=2&max_batch_delay=5000&initial_workers=3"
+```
+
+Infer the model using the following command
+
+```
+curl http://localhost:8080/predictions/llm -T prompt.txt
+```
+
+This example supports batching. To run batch prediction, run the following command 
+
+```
+curl http://localhost:8080/predictions/llm -T prompt.txt & curl http://localhost:8080/predictions/llm -T prompt1.txt &
+```
+
+Sample Response
+
+```
+Hello my name is Daisy. Daisy is three years old. She loves to play with her toys.
+One day, Daisy's mommy said, "Daisy, it's time to go to the store." Daisy was so excited! She ran to the store with her mommy.
+At the store, Daisy saw a big, red balloon. She wanted it so badly! She asked her mommy, "Can I have the balloon, please?"
+Mommy said, "No, Daisy. We don't have enough money for that balloon."
+Daisy was sad. She wanted the balloon so much. She started to cry.
+Mommy said, "Daisy, don't cry. We can get the balloon. We can buy it and take it home."
+Daisy smiled. She was so happy. She hugged her mommy and said, "Thank you, mommy!"
+```