Add 'git-UpdateCheck.sh'

git-UpdateCheck.sh

@@ -0,0 +1,17 @@
+#Git update checker 
+git remote update
+
+UPSTREAM=${1:-'@{u}'}
+LOCAL=$(git rev-parse @)
+REMOTE=$(git rev-parse "$UPSTREAM")
+BASE=$(git merge-base @ "$UPSTREAM")
+
+if [ $LOCAL = $REMOTE ]; then
+    echo "Up-to-date"
+elif [ $LOCAL = $BASE ]; then
+    echo "Need to pull"
+elif [ $REMOTE = $BASE ]; then
+    echo "Need to push"
+else
+    echo "Diverged"
+fi