[FEATURE REQUEST] Scroll to Top button

## Description
**Is your feature request related to a problem? Please describe.**
When user scroll down then there should be button to back to top of the website which is not present here so they have to scroll again to back to top.

**Describe the solution you'd like**
I would like to add scroll to top button so that user can went to top of website in a single click.

## Additional Information
**Potential Implementation** (optional)
Create button for that and make its position fixed and add event listener on it and then add animation so that it will move to top of website.

**Screenshots or Mockups** (optional)
Button will be in highlighted area.

**Priority** (optional)
Medium