Add json_count_keys usage example

[RUNQILIU-123]

Summary

This pull request adds an initial usage example for json_count_keys in the json category.

Files added

• json_count_keys-1-example.cpp
• json_count_keys-1-example.py
• json_count_keys-1-example-top-level.cs
• json_count_keys-1-example-oop.cs
• json_count_keys-1-example.txt
• json_count_keys-1-example.png

What the example does

This example creates a Json object, adds a few top-level values, and displays the number of top-level keys.

Testing

Tested by running:

• C++ version
• Python version
• C# top-level version
• C# oop version

Verified that:

• the program runs correctly
• the Json object is created successfully
• the output shows the correct top-level key count

Notes

This is a small usage example for the json_count_keys function in the json category.

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[himanshigaba22]

Clean and simple example, and the deploy is passing nicely! A few things to fix up though - the .txt file has 2 lines when it should be title only, so the description line needs to go.

Also, none of the language versions call free_json() after creating the JSON object, which should be added to avoid a memory leak. Worth also confirming whether usage-example-references.json has been updated or if the dynamic scanner handles it.

Everything else looks good - the file manifest is complete, the namespace is properly wrapped, and the Python conventions are correct. Once those are sorted, it should be good to go!