[BE] docs: 데모용 리드미 작성

[Juhyung990122]

Issues

• [x] 데모용 리드미 변경

논의사항

close #465

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Unit Test Results

  31 files    31 suites   12s :stopwatch: 170 tests 169 :heavy_check_mark: 1 :zzz: 0 :x: 174 runs  173 :heavy_check_mark: 1 :zzz: 0 :x:

Results for commit 4eeacfc8.

:recycle: This comment has been updated with latest results.

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📊 ternoko-482 분석 결과 확인하기 링크