Add full example that uses multiple options to http-client-csharp README

[Copilot]

The README lacked concrete examples of how to configure multiple emitter options, showing only a placeholder option: value. Custom emitter authors also need guidance on using their own emitter name in options.

Changes

• Added command-line example with multiple --option flags
• Updated YAML config example with real option names/values
• Added note for custom emitter authors about specifying their emitter name

Example

Command line:

tsp compile . --emit=@typespec/http-client-csharp \
  --option "@typespec/http-client-csharp.package-name=MyClient" \
  --option "@typespec/http-client-csharp.generate-protocol-methods=false"

YAML config:

emit:
  - "@typespec/http-client-csharp"
options:
  "@typespec/http-client-csharp":
    package-name: MyClient
    generate-protocol-methods: false
    generate-convenience-methods: true

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add full example that uses multiple options</issue_title>
<issue_description>In the docs, we should make it clear how to pass options by showing a full command that uses multiple emitter options.

We should also highlight that custom emitters need to specify their emitter name in the options.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add full example that uses multiple options #6155

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