Add DeepSpeed-Chat Blogpost (#3185)

Co-authored-by: NSamyam Rajbhandari <samyamr@microsoft.com>
Co-authored-by: NReza Yazdani <reyazda@microsoft.com>
Co-authored-by: NSamyam Rajbhandari <samyamr@microsoft.com>
Co-authored-by: NConglong Li <conglong.li@gmail.com>
Co-authored-by: NJeff Rasley <jerasley@microsoft.com>
Co-authored-by: NZhewei Yao <zheweiyao@gmail.com>

blogs/README.md

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