Add test to verify custom request headers

[gcatanese]

Adding custom request headers is already supported by the library, this PR adds a test to confirm and updates the README

[gemini-code-assist]

Summary of Changes

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This pull request focuses on enhancing the robustness and clarity around the use of custom request headers within the library. It introduces a dedicated test to confirm the existing functionality of custom headers and updates the documentation to provide clear guidance and an example for developers on how to implement them. This ensures that the feature is well-tested and easily discoverable for users.

Highlights

• Custom Header Testing: A new test case has been added to httpClient.spec.ts to explicitly verify that custom request headers are correctly sent and processed by the HTTP client.
• Documentation Update: The README.md has been updated with a new section and a code example demonstrating how to include custom HTTP headers in API requests using the headers property within IRequest.Options.

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[gemini-code-assist]

Code Review

This pull request adds a test for custom request headers and updates the README accordingly. The changes are good and the new test is well-written. I've provided a few suggestions to improve the documentation's clarity and consistency, as well as to refine the new test case. My feedback focuses on reducing redundancy in the README, ensuring consistent code style in examples and tests, and making test assertions more concise.