[FEATURE] Create a Site Configuration (#9)

Author: DragosTARX

Documentation/10GettingStarted/20BasicConfiguration/30SetUpASiteConfiguration/SetUpASiteConfiguration.md

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+# Set Up a Site Configuration
+
+<!-- #TYPO3v13 #Beginner #Backend #Configuration @dragos_tuluc -->
+
+In TYPO3, a site configuration is essential for defining the domain, root page, and languages for a website.
+
+## Learning objective
+
+This guide explains how to create and configure a new site in a TYPO3 installation.
+
+## Prerequisites
+
+*   A running TYPO3 instance.
+*   A "root page" created in the page tree to serve as the starting point of the new website.
+
+## Navigate to the Sites Module
+
+1. Log in to your TYPO3 backend.
+2. In the main menu, go to **SITE MANAGEMENT > Sites**.
+
+## Create a New Site Configuration
+
+1. Click the **"Add new site configuration"** button or the `+` icon if you already have other sites.
+2. TYPO3 will often suggest creating a site based on an existing root page that is not yet configured.
+3. In the *General* tab, add your information to the following fields:
+    *   **Site Identifier:** A unique, lowercase name for the site (e.g., `my_website`). This is used internally by TYPO3.
+    *   **Root Page ID:** This is the most important setting. Select the page from your page tree that will be the root of your website (e.g., your "Home" page).
+    *   **Base URL:** The primary domain for the site, including the protocol (e.g., `https://www.example.com/`).
+4. In the Languages tab, click *Create new Language*. A new language form will appear.
+5. Fill in the following fields with your information:
+    *   **Title:** The human-readable name of the language (e.g., "English").
+    *   **Entry Point:** The URL segment for this language. The default language should use `/`. Additional languages might use a prefix (e.g., `/de/`).
+    *   **Locale:** The locale for the language, which is important for date formatting and other localizations (e.g., `en_US.UTF-8`).
+6. In the **Error Handling** tab, fill in the following fields with your information:
+    *   Switch to the **Error Handling** tab.
+    *   Define how TYPO3 should handle HTTP error status codes, such as `404 Not Found`.
+    *   You can set a specific page to display, redirect to another URL, or use a custom Fluid template for each error code.
+7. Click the **Save** button to store your new site configuration.
+
+## Summary
+
+You have successfully created a site configuration. Your website is now accessible through the configured domain, and TYPO3 knows which page tree belongs to it.
+
+## Next Steps
+
+*   **Add More Languages:** If your site is multilingual, you can add more languages in the *Languages* tab by repeating steps 4–5 above.
+*   **Domain Variants:** Create variants for different domains or subdomains that point to the same site but might have slightly different settings.
+*   **Static Routes:** For advanced URL routing, you can explore the *Static Routes* tab.