Add Plugins (a template and awocoupon) for custom variables

plugins/awocoupon/Makefile

plugins/awocoupon/awocoupon.php

plugins/awocoupon/awocoupon.script.php

plugins/awocoupon/awocoupon.xml

plugins/awocoupon/index.html

...guage/en-GB/en-GB.plg_vmshipmentrules_rules_awocoupon.ini

...e/en-GB/en-GB.plg_vmshipmentrules_rules_awocoupon.sys.ini

plugins/awocoupon/language/en-GB/index.html

plugins/awocoupon/language/index.html

...wocoupon/plg_opentools_vmshipmentrules_awocoupon_v1.0.zip

plugins/template/Makefile

plugins/template/YOUR_PLUGIN_NAME.php

plugins/template/YOUR_PLUGIN_NAME.script.php

plugins/template/YOUR_PLUGIN_NAME.xml

plugins/template/create_rules_plugin.sh

plugins/template/index.html

...uage/en-GB/en-GB.plg_vmshipmentrules_YOUR_PLUGIN_NAME.ini

.../en-GB/en-GB.plg_vmshipmentrules_YOUR_PLUGIN_NAME.sys.ini

plugins/template/language/en-GB/index.html

plugins/template/language/index.html