Add citation information both in README as well as native GitHub file support (#1527)

SUMMARY:
Add citation information both in README as well as native GitHub file
support to enable standard citations within research papers and the
general ML community.

Fixes #1523 


TEST PLAN:
Manual verification of the formats, more info here:
https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-citation-files

---------

Signed-off-by: Mark Kurtz <mark.j.kurtz@gmail.com>
Co-authored-by: Dipika Sikka <dipikasikka1@gmail.com>

Author: markurtz

CITATION.cff

@@ -0,0 +1,8 @@
+cff-version: 1.2.0
+message: "If you use this software, please cite it as below."
+authors:
+  - name: Red Hat AI
+  - name: vLLM Project
+title: "LLM Compressor"
+date-released: 2024-08-08
+url: https://github.com/vllm-project/llm-compressor

README.md

@@ -120,3 +120,17 @@ output = model.generate("My name is")
 
 - If you have any questions or requests open an [issue](https://github.com/vllm-project/llm-compressor/issues) and we will add an example or documentation.
 - We appreciate contributions to the code, examples, integrations, and documentation as well as bug reports and feature requests! [Learn how here](CONTRIBUTING.md).
+
+## Citation
+
+If you find LLM Compressor useful in your research or projects, please consider citing it:
+
+```bibtex
+@software{llmcompressor2024,
+    title={{LLM Compressor}},
+    author={Red Hat AI and vLLM Project},
+    year={2024},
+    month={8},
+    url={https://github.com/vllm-project/llm-compressor},
+}
+```