docs: add the naming ADR

docs/source/decisions/0004-naming-of-the-plugin.rst

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+4. Naming of the plugin
+========================
+
+Status
+******
+
+Accepted
+
+
+Context
+*******
+
+Initially, we wanted a very descriptive name for this plugin (Open edX WooCommerce Plugin) to avoid confusion because there are different types of plugins in Open edX. Still, for `WordPress plugin guidelines`_, we cannot submit a plugin with the word "plugin" or trademarks as "woocommerce."
+
+Decision
+********
+
+- Change the name of the plugin to "Open edX Commerce."
+
+
+Consequences
+************
+
+- Change the name in all the code, including files and database names.
+
+- The WordPress plugin doesn't have the same name as the GitHub repository to store more information about this plugin that adds information in the Open edX context.
+
+
+Rejected Alternatives
+*********************
+
+- Use "ecommerce" in the name: to avoid confusion with the current e-commerce service.
+
+
+References
+**********
+
+- `WordPress plugin guidelines`_.
+- `Current ecommerce service`_.
+
+
+.. _WordPress plugin guidelines: https://developer.wordpress.org/plugins/wordpress-org/detailed-plugin-guidelines/#17-plugins-must-respect-trademarks-copyrights-and-project-names
+.. _Current ecommerce service: https://github.com/openedx/ecommerce