Add quantize script for batch quantization (#92)

* Add quantize script for batch quantization

* Indentation

* README for new quantize.sh

* Fix script name

* Fix file list on Mac OS

---------

Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>

quantize.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+if ! [[ "$1" =~ ^[0-9]{1,2}B$ ]]; then
+    echo
+    echo "Usage: quantize.sh 7B|13B|30B|65B [--remove-f16]"
+    echo
+    exit 1
+fi
+
+for i in `ls models/$1/ggml-model-f16.bin*`; do
+    ./quantize "$i" "${i/f16/q4_0}" 2
+    if [[ "$2" == "--remove-f16" ]]; then
+        rm "$i"
+    fi
+done