[FEATURE] .NET client generation

# Add Support for .NET Client Generation in Industry Toolkit

**Description:**
The Industry Toolkit will include support for generating client SDKs in .NET based on API definitions. This will allow developers to generate .NET clients for APIs created with the toolkit, improving integration with .NET-based systems.

### Feature Requirements:
- Generate .NET client SDKs from API definitions.
- Ensure compatibility with various .NET versions and frameworks (e.g., .NET Core, .NET Framework).
- Provide documentation and code comments in the generated SDKs.
- Include usage examples to guide developers in integrating the SDKs.
- Write tests to validate the correctness and functionality of the generated SDKs.

### Acceptance Criteria:
- [ ] .NET client generation feature is implemented.
- [ ] Generated SDKs include documentation and are tested for correctness.
- [ ] README and documentation are updated with instructions on generating and using .NET clients.

**Additional Context:**
This feature will simplify the process of integrating APIs with .NET applications by providing ready-to-use client SDKs.

The issue names no implementation files, tests, or entry points; start by locating the API-definition and existing client-generation components in the repository. Define the .NET generation scope across supported frameworks, then add generator tests, usage examples, and documentation so the acceptance criteria can be checked.

Written by the indexing model from the issue text.