[Docs] Adding links and intro to Speculators and LLM Compressor (#32849)

Signed-off-by: Aidan Reilly <aireilly@redhat.com>
Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>
Co-authored-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

docs/features/quantization/llm_compressor.md

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+# LLM Compressor
+
+[LLM Compressor](https://docs.vllm.ai/projects/llm-compressor/en/latest/) is a library for optimizing models for deployment with vLLM.
+It provides a comprehensive set of quantization algorithms, including support for techniques such as FP4, FP8, INT8, and INT4 quantization.
+
+## Why use LLM Compressor?
+
+Modern LLMs often contain billions of parameters stored in 16-bit or 32-bit floating point, requiring substantial GPU memory and limiting deployment options.
+Quantization lowers memory requirements while maintaining inference output quality by reducing the precision of model weights and activations to smaller data types.
+
+LLM Compressor provides the following benefits:
+
+- **Reduced memory footprint**: Run larger models on smaller GPUs.
+- **Lower inference costs**: Serve more concurrent users per GPU, directly reducing the cost per query in production deployments.
+- **Faster inference**: Smaller data types mean less memory bandwidth consumed, which often translates to higher throughput, especially for memory-bound workloads.
+
+LLM Compressor handles the complexity of quantization, calibration, and format conversion, producing models ready for immediate use with vLLM.
+
+## Key features
+
+- **Multiple Quantization Algorithms**: Support for AWQ, GPTQ, AutoRound, and Round-to-Nearest.
+Also includes support for QuIP and SpinQuant-style transforms as well as KV cache and attention quantization.
+- **Multiple Quantization Methods**: Support for FP8, INT8, INT4, NVFP4, MXFP4, and mixed-precision quantization
+- **One-Shot Quantization**: Quantize models quickly with minimal calibration data
+- **vLLM Integration**: Seamlessly deploy quantized models with vLLM using the compressed-tensors format
+- **Hugging Face Compatibility**: Works with models from the Hugging Face Hub
+
+## Resources
+
+- [LLM Compressor examples](https://github.com/vllm-project/llm-compressor/tree/main/examples)
+- [GitHub Repository](https://github.com/vllm-project/llm-compressor)