Delete CONTRIBUTING.md

[Jacintaresendezaddams]

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TODO: Please describe your changes here.

TODO: Please read the following on ICU Contributing, and then delete these instructions.

Thank you for your pull request!

• For general info on contributing: https://github.com/unicode-org/icu/blob/main/CONTRIBUTING.md
• Associating PRs with Jira issues
  • We require each pull request to be associated with a Jira issue.
  • Reuse existing issues for minor changes:
    • ICU 77 docs minor fixes: ICU-22921 — User Guide & API docs typos etc., and version updates (e.g., dependabot for User Guide)
    • ICU 77 code warnings/version updates: ICU-22920 — Fix compiler warnings. Update versions of code-related dependencies (e.g., dependabot).
• Contributors license agreement (CLA):
  • You will be automatically asked to sign the CLA before the PR is accepted.
  • To sign the CLA: https://cla-assistant.io/unicode-org/icu
  • For terms of use and license, see https://www.unicode.org/terms_of_use.html

TODO: Fill out the checklist below.

Checklist

• Required: Issue filed: ICU-NNNNN
• Required: The PR title must be prefixed with a JIRA Issue number. Example: "ICU-1234 Fix xyz"
• Required: Each commit message must be prefixed with a JIRA Issue number. Example: "ICU-1234 Fix xyz"
• Issue accepted (done by Technical Committee after discussion)
• Tests included, if applicable
• API docs and/or User Guide docs changed or added, if applicable

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}