Add GGUF README

GGUF/README.md

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+# GGUF Models
+
+This folder contains quantized GGUF versions of the CardVault+ model for efficient inference with llama.cpp.
+
+## Available Models
+
+| Model File | Size | Quantization | Use Case |
+|---|---|---|---|
+| `cardvault-500m-f16.gguf` | 783MB | F16 (Base) | Maximum quality |
+| `cardvault-500m-mmproj-f16.gguf` | 191MB | F16 (Vision) | **REQUIRED** |
+| `cardvault-500m-q8_0.gguf` | 417MB | Q8_0 | Near-perfect quality |
+| `cardvault-500m-q6_k.gguf` | 399MB | Q6_K | Balanced |
+| `cardvault-500m-q5_k_m.gguf` | 311MB | Q5_K_M | **Recommended** |
+| `cardvault-500m-q4_k_m.gguf` | 290MB | Q4_K_M | Maximum compression |
+
+## Usage
+
+```bash
+# Download llama.cpp
+git clone https://github.com/ggerganov/llama.cpp
+cd llama.cpp && make
+
+# Run inference (Q5_K_M recommended)
+./main \
+  --model cardvault-500m-q5_k_m.gguf \
+  --mmproj cardvault-500m-mmproj-f16.gguf \
+  --image credit_card.jpg \
+  --prompt "Extract card information in JSON format"
+```
+
+⚠️ **Critical**: Both text model + mmproj required for vision functionality!