Add a rock-paper-scissors CLI game

[utk2103]

Add a playable rock-paper-scissors game to scripts/.

Why

Covers the beginner core in ~40 lines: input(), random, while loop, dict lookup for the win table, and clean exit handling. Much friendlier than jumping straight to algorithms.

Suggested file

scripts/rock_paper_scissors.py

What it should do

• Prompt for rock / paper / scissors (accept r/p/s too).
• Computer picks with random.choice, print the round result.
• Keep a running score; q quits and prints the final tally.

Acceptance criteria

• Win logic is a dict or tuple table (beats = {"rock": "scissors", ...}), not a chain of if/elif.
• Invalid input re-prompts instead of crashing.
• Ctrl+C exits cleanly with the score, no traceback.
• Standard library only.

Inspiration

Rock-Paper-Scissor from Awesome-Python-Scripts.

Good first issue — comment below to get assigned.