Update README.md

[Sturlock]

• Updated README

[what-the-diff]

PR Summary

• Updated Task Section
  The task section of the project has been revamped with completed tasks being indicated clearly. Particularly, tasks regarding deterministic non-physics-based bullet drop and bullet travel have been completed and thus removed from the 'To-do' list.

• Amplified Completed Features Section
  The 'Completed Features' section, highlighting the program capabilities, has been expanded. We've added a feature pertaining to custom physics-based bullets. This also includes details about various types of ammunition divided by weapon classes such as Handguns/Pistols, Submachine Guns/Personal Defense Weapons, Rifles, Snipers, and others with specific calibers mentioned.

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[EduardHClevett]

All good!