Fixes#33
Add a new section "System Prompts and Expected Prompt Format" to `README.md`.
* **System Prompts**: Describe the system prompts used for the R1 distilled models, including examples for general prompts, math problem prompts, code generation prompts, and reasoning task prompts.
* **Expected Prompt Format**: Provide examples of the expected prompt format for interacting with the R1 distilled models, including general inquiries, math problems, code generation, and reasoning tasks.
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