Hithomelabs/CFTunnels#115: Fix indentation (tabs to spaces) and add comprehensive JavaDoc

src/main/java/com/hithomelabs/CFTunnels/CfTunnelsApplication.java

@@ -3,9 +3,44 @@ package com.hithomelabs.CFTunnels;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 
+/**
+ * Main Spring Boot application class for Cloudflare Tunnels API.
+ *
+ * <p>This application provides a RESTful API for managing Cloudflare Tunnels,
+ * allowing users to create tunnel mappings to services with an approval workflow.</p>
+ *
+ * <p><b>Features:</b></p>
+ * <ul>
+ *   <li>Create, update, and delete Cloudflare tunnels</li>
+ *   <li>Add ingress mappings to tunnels</li>
+ *   <li>Request/approval workflow for mapping changes</li>
+ *   <li>OIDC-based authentication with role-based access</li>
+ * </ul>
+ *
+ * <p><b>Technology Stack:</b></p>
+ * <ul>
+ *   <li>Java 17</li>
+ *   <li>Spring Boot 3.x</li>
+ *   <li>Spring Data JPA</li>
+ *   <li>Spring Security with OIDC</li>
+ *   <li>H2 Database (configurable for PostgreSQL)</li>
+ *   <li>Cloudflare API</li>
+ * </ul>
+ *
+ * <p>Access the API documentation at:
+ * {@code /swagger-ui.html} for the Swagger/OpenAPI UI</p>
+ *
+ * @see <a href="https://developers.cloudflare.com/cloudflare-one/connections/connect-apps/install-negative">Cloudflare Tunnel Documentation</a>
+ * @since 1.0.0
+ */
 @SpringBootApplication
 public class CfTunnelsApplication {
 
+    /**
+     * Main entry point for the application.
+     *
+     * @param args command line arguments passed to the application
+     */
     public static void main(String[] args) {
         SpringApplication.run(CfTunnelsApplication.class, args);
     }