feat: add database connection handler

src/main/java/dev/database/DatabaseConnection.java

@@ -0,0 +1,27 @@
+package dev.database;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+
+public class DatabaseConnection {
+
+    private static final String URL = "jdbc:postgresql://localhost:5432/restaurant_db"; // DB Server
+
+    private static final String USER = "postgres"; // Your Username
+
+    private static final String PASSWORD = "password"; // Your Password
+
+    private DatabaseConnection() {
+
+    }
+
+    public static Connection getConnection()
+            throws SQLException {
+
+        // TODO:
+        // Return a valid PostgreSQL connection
+
+        return null;
+    }
+
+}