Add initial files and templates for ps_emailalerts module

- Created LICENSE file for composer dependencies.
- Added autoload files: autoload_classmap.php, autoload_namespaces.php, autoload_psr4.php, autoload_real.php, and autoload_static.php.
- Initialized installed.json for composer.
- Added index.php and form templates for admin configuration.
- Implemented front-end templates for email alerts, including account management and product notifications.
- Included necessary headers and copyright notices in all new files.

modules/ps_emailalerts/README.md

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+# Mail alerts
+
+## About
+
+Make your everyday life easier, handle mail alerts about stock and orders, addressed to you as well as your customers.
+
+## Compatibility
+
+PrestaShop: `1.7.7.0` or later
+
+## Multistore compatibility
+
+This module is partially compatible with the multistore feature. Some of its options might not be available.
+
+## How to test
+
+Link to specs : https://docs.prestashop-project.org/functional-documentation/functional-documentation/ux-ui/back-office/improve/modules/configure-mail-alerts-ps_mailalerts
+
+Configure Customer notifications and Merchant notifications
+Add stock to product, edit an order, place an order, remove stock from product, set threshold for a product. 
Check that the emails are well sent
+
+## Reporting issues
+
+You can report issues with this module in the main PrestaShop repository. [Click here to report an issue][report-issue]. 
+
+## Contributing
+
+PrestaShop modules are open source extensions to the [PrestaShop e-commerce platform][prestashop]. Everyone is welcome and even encouraged to contribute with their own improvements!
+
+Just make sure to follow our [contribution guidelines][contribution-guidelines].
+
+## License
+
+This module is released under the [Academic Free License 3.0][AFL-3.0] 
+
+[report-issue]: https://github.com/PrestaShop/PrestaShop/issues/new/choose
+[prestashop]: https://www.prestashop.com/
+[contribution-guidelines]: https://devdocs.prestashop.com/1.7/contribute/contribution-guidelines/project-modules/
+[AFL-3.0]: https://opensource.org/licenses/AFL-3.0