add torpedo and fix diana's orientation

[justine-lin1]

Related Issue(s)

• Issue Update README.md #1
• Issue Update .gitignore.txt #2

Other Dependent PRs

• PR Update .gitignore.txt #2
• PR Add water to sim #3

Changes Made

• added simple torpedo to the sim and fixed diana's orientation

Rationale/Other Solutions Considered

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Tests Done

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Optional Screen Recording

torpedo.3.mp4

Required Wiki Changes (if any)

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Required install_dependencies.sh Changes (if any)

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Related Branches (other than one that will be merged)

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