Request: Add Costs estimate

Could you add a Costs section to the README, such as https://github.com/Azure-Samples/azure-search-openai-demo/?tab=readme-ov-file#cost-estimation ?
It's recommended best practice to make sure developers understand the price consequences of deploying a project.

It'd also be great to support deployment to lower cost tiers when relevant, like we document here:
https://github.com/Azure-Samples/azure-search-openai-demo/blob/main/docs/deploy_lowcost.md

Start with the repository README and any deployment documentation, then compare the linked cost-estimation and low-cost deployment examples. Document the expected deployment costs and identify which lower-cost tiers are relevant to this Java Azure sample. Done means the README has a Costs section and the applicable lower-cost deployment guidance is documented.

Written by the indexing model from the issue text.