Add initial Copenhagen Truck Wash API documentation, including API overview, authentication, error handling, introduction, and Writerside configuration.

documentation/topics/Introduction.topic

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE topic
+        SYSTEM "https://resources.jetbrains.com/writerside/1.0/xhtml-entities.dtd">
+<topic xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+       xsi:noNamespaceSchemaLocation="https://resources.jetbrains.com/writerside/1.0/topic.v2.xsd"
+       title="Introduction" id="Introduction">
+
+    <p>Welcome to the %product% documentation.</p>
+    <p>This API provides access to the Copenhagen Truck Wash system, allowing you to manage wash bookings, vehicle data, and customer information.</p>
+
+    <chapter title="Overview" id="overview">
+        <p>The API is built on REST principles and returns JSON-encoded responses.</p>
+    </chapter>
+</topic>