Shell/Bash: checklist github readme Example

Shell/Bash Example: This is the "checklist github readme" Example. compiled from many sources on the internet by SimpleTutorials.org

### Solar System Exploration, 1950s – 1960s

- [ ] Mercury
- [x] Venus
- [x] Earth (Orbit/Moon)
- [x] Mars
- [ ] Jupiter
- [ ] Saturn
- [ ] Uranus
- [ ] Neptune
- [ ] Comet Haley

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