Added script to create branch for QMK

Bin/qmkCreateBranch.sh

@@ -0,0 +1,14 @@
+#! /bin/bash
+
+if [ -z "$1" ]; then
+  echo "Missing branch name"
+  exit 1
+fi
+
+git checkout master
+git fetch upstream
+git pull upstream master
+git push origin master
+
+git checkout -b $1
+git push --set-upstream origin $1