[REQ][csharp-netcore] Add Http response details and fix example snippet

[saigiridhar21]

Is your feature request related to a problem? Please describe.

• Add HTTP response details on the api_docs for each API method.
• "<" and ">" are getting rendered as < and > in example snippets

Describe the solution you'd like

Fix the mustache templates

Describe alternatives you've considered

Additional context