Added Segment Tree file

[riyasingh240601]

Related Issue

• adding a file of segment tree along with its code in advance data structure #1445

Proposed Changes

added a segment tree code file.

Additional Info

I'm a GSSoC'22 contributor. I've made the required changes. Kindly merge it to the main.

Checklist

• [x] ✅ My code follows the code style of this project.
• [ ] 📝 My change requires a change to the README.
• [x] 🎀 I have updated the README accordingly.
• [x] 👀 I have read the CONTRIBUTING document.
• [x] ✨ I have added tests to cover my changes.
• [x] 🚩 All new and existing tests passed.
• [x] 🌟 ed the repo

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Output Screenshots

Screenshot #1
code

Screenshot #2

continuation of previous code

Screenshot #3 Output

[aditi944]

Please add required screenshots of code and output

[riyasingh240601]

Added screenshots of code and output @aditi944

[aditi944]

Add title just above the images

[riyasingh240601]

@aditi944 now is it okay?

[aditi944]

yes