Create RainBow-Poem

[Alphacolo]

• [ ] This pull request follows Coding Train Code of Conduct
• [ ] This pull request doesn't delete submissions from others.
• [ ] This pull request is family friendly and doesn't include any NSFW content.
• [x] I have learned something new about git and GitHub today!

[Alphacolo]

I re added the Rainbow-Poem .txt file to the repo