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README.md

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+# Supercardinality Online Services
+
+The reference implementation for online services for Supercardinality.
+
+## Setup
+
+Create the `config.php` file based on `config.php.example`.
+
+Host the repo root using a PHP capable web server.
+
+It's a good idea to block access to your state file.
+A common way to protect it from being publicly readable is to configure it to be outside of the web server.
+If you store it in the default location you may want to block access to it using URL rewrite rules.