Add setup instructions.

readme.md

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+# help.verua.ch
+
+Containerized backup of old ticketing system OSTicket. DDEV is being used to replicate the server environment:
+
+- PHP 7.4
+- MariaDB 5.5
+
+## Requirements
+
+- DDEV installed on your machine. Check with `ddev --version`
+- Backup of the OS Ticket database: sh30356_help_fr.sql
+
+## Setup
+
+1. Clone the repository to your local machine:
+
+```bash
+git clone ssh://git@code.verua.online/VeruA/help.verua.ch.git
+```
+
+2. Import database `sh30356_help_fr.sql`  
+**Important**: The database has to be copied / downloaded from a backup. It is **not** inside this repository.
+
+```
+cd help.verua.ch
+ddev import-db --file=/path/to/sh30356_help_fr.sql
+```
+
+3. Run ddev
+```
+ddev start
+```
+
+The application should be now available under http://os-ticket.ddev.site.
+