Add check-version.sh script

check-version.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+URL="https://gmplib.org/"
+
+# Get version number
+VERSION=$(curl -s -L "$URL" | grep 'The current stable release is ' | grep -o -E '[0-9]{1,}.[0-9]{1,}(\.[0-9]{1,}|)' | head -n1)
+
+echo "$VERSION"