Add basic readme

README.md

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+LSBC
+====
+
+A small platform to create podcasts and episodes, host the audio files and share
+the RSS feed, with external sources download abilities.
+
+
+
+Install
+-------
+
+This project requires:
+
+- PHP 8
+- PostgreSQL 15 and its PHP driver
+
+For production:
+
+1. Clone the repository.
+2. Setup your web server to use PHP-FPM (root is `./public`).
+3. Create the production config file: `composer dump-env prod`. Set a proper app
+   secret.
+4. Create a database and its owner, then set appropriate database credentials in
+   the config file.
+5. Install dependencies: `composer install --no-dev`.
+6. Apply database migrations: `php bin/console doctrine:migrations:migrate`