Fix syntax and initialization in README example

[albertomercurio]

Adjusted c_result initialization.

[github-actions]

🤖 Hi @albertomercurio, I've received your request, and I'm working on it now! You can track my progress in the logs for more details.

[github-actions]

📋 Review Summary

This Pull Request addresses a syntax fix and a crucial initialization correction in the README.md example. The changes improve the correctness and idiomatic style of the code snippet.

🔍 General Feedback

• The changes are well-targeted and directly resolve potential issues in the example code.
• The correction for c_result initialization is important for the mul! function to execute without errors.

[github-actions]

🟢 It's good practice to omit the semicolon in Julia examples unless output suppression is explicitly desired for clarity or brevity in an interactive session. Removing it makes the example more idiomatic.

Suggested change

	A_device = DeviceSparseMatrixCSC(A_sparse)
	A_device = DeviceSparseMatrixCSC(A_sparse)

[github-actions]

🟠 The similar(b, 100) modification correctly addresses a dimension mismatch. The result of A_device * b will be a vector with 100 elements, so c_result must be initialized to that size for mul! to work correctly. Great catch and fix!

Suggested change

	c_result = similar(b, 100)
	c_result = similar(b, 100)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.34%. Comparing base (17d03ca) to head (388dd36).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #23   +/-   ##
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  Coverage   84.34%   84.34%           
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  Files          13       13           
  Lines         728      728           
=======================================
  Hits          614      614           
  Misses        114      114           

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