📝Add README.md

Author: fabiancdng

.github/media/upload-plugin-screenshot.jpg

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+# Disable WP Frontend
+
+A simple, lightweight WordPress plugin to disable the WordPress front end in headless environments.
+
+## Installation
+
+1. Download the `disable-wp-frontend.zip` file from
+   the [latest release](https://github.com/fabiancdng/disable-wp-frontend/releases/latest).
+2. In your WordPress admin panel, navigate to `Plugins -> Add New`.
+3. Click `Upload Plugin` at the top of the page.
+4. Upload the `disable-wp-frontend.zip` file.
+5. Activate the plugin.
+
+![Upload Plugin](.github/media/upload-plugin-screenshot.jpg)
+
+## Updating to a new version
+
+Upgrading to a new version can be done entirely from within the WordPress admin panel. No need to upload a new zip file!
+
+The plugin will automatically check for updates twice a day.
+
+If you want to check for updates manually, you can click
+the `Check for updates` button on the plugin's settings page.
+
+## Credits
+
+"Disable WP Frontend" uses the following third-party open-source libraries and packages:
+
+* [`plugin-update-checker`](https://github.com/YahnisElsts/plugin-update-checker) by Yahnis Elsts