added experimental upstream version check script

upstream-version-check.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+cd /tmp
+
+if [[ -d intellij ]]; then
+    echo "An 'intellij' directory already exists. Aborting..."
+fi
+
+git clone -q  https://gitlab.com/mmk2410/intellij-idea-community.git intellij
+
+cd intellij
+
+uscan --nodownload
+RESULT=$?
+
+if [[ $RESULT -eq 0 ]]; then
+    echo "New IntelliJ IDEA Version" | mail -s "New IntelliJ IDEA Version" opensource@mmk2410.org
+fi
+
+cd ..
+rm -rf intellij
+
+exit $RESULT