refactor variable declarations in Program.cs

[rubentalstra]

This pull request includes various changes to the .idea directory configuration files and multiple refactorings in the Program.cs file to improve code readability and maintainability. The most important changes are listed below:

Configuration Files:

• Added default and Rider-specific ignored files to .gitignore in the .idea directory.
• Added new configuration files for project encodings, index layout, material theme settings, and version control mappings. [1] [2] [3] [4]

Code Refactoring:

• Changed variable declarations from public to private in Program.cs to encapsulate the variables and improve security.
• Renamed variables to follow camelCase naming conventions for consistency. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11]
• Converted public methods to private where applicable to limit their scope and adhere to the principle of least privilege. [1] [2] [3]
• Replaced using with await using for asynchronous file operations to ensure proper disposal of resources.
• Refactored switch statements to replace multiple if-else conditions for better readability and maintainability. [1] [2] [3]