port: [#6018] Move Dotnet generators from Samples to "generators" - VSIX - Echo Bot (#6052)

[github-actions[bot]]

The changes in [#6018] Move Dotnet generators from Samples to "generators" - VSIX - Echo Bot (#6052) may need to be ported to maintain parity with microsoft/botbuilder-dotnet.

Addresses #6018 #minor

Description

This PR adds the VSIX project and the Echo bot from the BotBuider-Samples repository. It also includes the root documentation for the vsix-vs-win folder.

Detailed Changes

• Added HOW_TO_VERSION, LICENSE, and README docs.
• Added generators/vsix-vs-win/BotBuilderVSIX-V4/BotBuilderTemplatesVSIX project.
• Added generators/vsix-vs-win/BotBuilderVSIX-V4/UncompressedProjectTemplates/EchoBot project.
• Fixed some StyeCop issues in the code.

Testing

These images show the extension being installed and the bot working as expected.

Please review and, if necessary, port the changes.