Add GCD script (task 1)

script_GCD.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+
+gcd() {
+    local a=$1
+    local b=$2
+    
+    while [ $b -ne 0 ]; do
+        local temp=$b
+        b=$((a % b))
+        a=$temp
+    done
+    
+    echo $a
+}
+
+
+if [ $# -ne 2 ]; then
+    echo "Usage: $0 <number1> <number2>"
+    exit 1
+fi
+
+
+result=$(gcd $1 $2)
+echo "НОД($1, $2) = $result"