Miscellaneous fixes

[josesimoes]

Description

• Fix README
  • Save with UTF8 encoding.
  • Add missing welcome title.
  • Add missing empty line at end.
• Fix nuspecs.
• Remove unnecessary AssemblyNativeVersion attribute.
• Fix URL for documentation.
• Fix namespace and assembly name.
• Add property to flag as core library.
• Add missing property to generate documentation file.
• Fix file names in nuspec.
• Add missing comment for doc.
• Migrate SLN file to VS2022.

Motivation and Context

• Fix issues preventing generating and publishing nuget package.

How Has This Been Tested?

Screenshots

Types of changes

• Improvement (non-breaking change that improves a feature, code or algorithm)
• Bug fix (non-breaking change which fixes an issue with code or algorithm)
• New feature (non-breaking change which adds functionality to code)
• Breaking change (fix or feature that would cause existing functionality to change)
• Config and build (change in the configuration and build system, has no impact on code or features)
• Dependencies (update dependencies and changes associated, has no impact on code or features)
• Unit Tests (add new Unit Test(s) or improved existing one(s), has no impact on code or features)
• Documentation (changes or updates in the documentation, has no impact on code or features)

Checklist:

• My code follows the code style of this project (only if there are changes in source code).
• My changes require an update to the documentation (there are changes that require the docs website to be updated).
• I have updated the documentation accordingly (the changes require an update on the docs in this repo).
• I have read the CONTRIBUTING document.
• I have tested everything locally and all new and existing tests passed (only if there are changes in source code).
• I have added new tests to cover my changes.