feat: added typing speed tester

[Satvik-Singh192]

Description

Added a new mini project "Typing Speed Tester" — a console-based C++ program that measures how fast and accurately a user can type a given code snippet.
The program displays random code lines, records the typing time, calculates Words Per Minute (WPM), checks accuracy, highlights mistakes, and shows a final summary.

Semver Changes

• Patch (bug fix, no new features)
• Minor (new features, no breaking changes)
• Major (breaking changes)

Issues

Closes #61 — [Feature]: Add a Code Typing Speed Tester

Checklist

• I have read the Contributing Guidelines.
• The code compiles and runs successfully.
• The feature has been tested for different inputs.
• Code is properly formatted and commented.

[Satvik-Singh192]

@prajwal3114 please review my PR