feat: add Tiny Resume Keyword Checker

[TrueFurina]

Summary

Adds Tiny Resume Keyword Checker (#1316): compares resume text with a job description and scores keyword matches.

Features

• extract_keywords(job_text) — extracts meaningful keywords from a job description (repeated words + long skill terms, stop words removed)
• score_resume(resume_text, keywords) — matches resume tokens against the keyword list, returns matched/missing keywords and a 0-1 score
• CLI: python resume_keyword_checker.py resume.txt job_description.txt prints extracted count, matched/missing lists, and a percentage score
• Follows the repo's single-file, ~100-line project convention (98 lines with docstrings)

Verification

• Syntax check passed
• Local test: resume mentioning python/fastapi/kubernetes vs a job description emphasizing python + fastapi → keywords extracted correctly, matched list correct, score 44%