fix: correct typos and improve image attributes in README.md

[scubaninja]

This pull request updates the README.md file for the "Using GitHub Copilot with C#" project to improve clarity and fix minor issues. The changes include adjustments to image dimensions, corrections to text, and improvements to instructions.

Documentation Improvements:

• Updated image dimensions for better readability in the "Run and Debug" section (003RunBackEndProject.jpg and 004rundebugURL.jpg) by adding width and height attributes.
• Corrected a typo in the endpoint URL from /weatherforcast to /weatherforecast in the instructions for accessing the Weather API.
• Adjusted the numbering in the step-by-step guide to ensure consistent formatting, changing a step from "3" to "1" in the refactoring section.
• Fixed grammatical issues in the code comment example, changing "create a new internal record named WeatherForecastByCity that request" to "create a new internal record named WeatherForecastByCity that requests."