feat: Illustrate simple 1 line main() in CityTimeWeather tutorial

[vorburger]

Following up to and now applying #372 to #371.

[gemini-code-assist]

Summary of Changes

Hello @vorburger, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request streamlines the execution of the CityTimeWeather tutorial by integrating the web server startup directly into the tutorial's main class. This change allows the tutorial to be run as a standalone application, simplifying its setup and execution process for users.

Highlights

• Simplified Tutorial Execution: The CityTimeWeather tutorial can now be run directly as a standalone application by executing its main method, eliminating the need to specify a separate web server class.
• pom.xml Configuration Update: The pom.xml file for the city-time-weather tutorial has been updated to reflect the new main class, pointing to com.google.adk.tutorials.CityTimeWeather for execution.
• New main Method: A public static void main(String[] args) method has been added to the CityTimeWeather class, which initializes and starts the AdkWebServer with the ROOT_AGENT.

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[gemini-code-assist]

Code Review

This pull request successfully simplifies the entry point for the CityTimeWeather tutorial by adding a main method to the CityTimeWeather class and updating the pom.xml to use it. The changes are straightforward and achieve the intended goal. I have one suggestion to improve code readability.