Add enabling utf8 mode note to readme

samples/cpp/beam_search_causal_lm/README.md

@@ -18,6 +18,7 @@ optimum-cli export openvino --trust-remote-code --model TinyLlama/TinyLlama-1.1B
 `beam_search_causal_lm TinyLlama-1.1B-Chat-v1.0 "Why is the Sun yellow?"`
 
 To enable Unicode characters for Windows cmd open `Region` settings from `Control panel`. `Administrative`->`Change system locale`->`Beta: Use Unicode UTF-8 for worldwide language support`->`OK`. Reboot.
+Also, you can enable UTF-8 mode by setting environment variable `PYTHONIOENCODING="utf8"`.
 
 Discrete GPUs (dGPUs) usually provide better performance compared to CPUs. It is recommended to run larger models on a dGPU with 32GB+ RAM. For example, the model meta-llama/Llama-2-13b-chat-hf can benefit from being run on a dGPU. Modify the source code to change the device for inference to the GPU.