add missing script to create plugin zip

Author: csteuer

.gitignore

@@ -1 +1 @@
-*.sh
+*.zip

.rsync_exclude

@@ -0,0 +1,23 @@
+#!/bin/sh
+
+set -e
+set -v
+
+version=$(jq -r ".version" < composer.json)
+root_folder="BuyButtonStateSynchronizer"
+filename="codebarista_buy_button_state_synchronizer_$version.zip"
+out_file="$PWD/$filename"
+
+rm -rf "/tmp/$root_folder"
+mkdir -p "/tmp/$root_folder"
+cp -r . "/tmp/$root_folder/"
+
+rm -f "$out_file"
+
+( cd /tmp && zip -r "$out_file" "$root_folder" \
+ -x "$root_folder/.*" \
+ -x "$root_folder/*.xcf" \
+ -x "$root_folder/bin*" \
+ -x "$root_folder/*.sh" \
+ -x "$root_folder/*.zip" \
+ -x "$root_folder/*.md")