📚 Documentation: Add readme files for concept Slices

[Yashsharma1911]

💬 Description

Add readme file for Slice

From this Readme you can take reference

steps how you can do it:

Create Readme.md file
Try to explain in simple language
Don't forget to add examples
Don't make it too long (should be like short and good article)
Add other helpful resources like (Blog, YouTube video, twitch)

👀 Have you spent some time to check if this issue has been raised before?

• I checked and didn't find similar issue

🔖 Have you read the Code of Conduct?

• Please search to see if an issue already exists for the bug or typo error you wanna add.

[nitinawari]

/assign