weight conversion tool

# Create a weight conversion tool in html,css and javascript.

- Add navbar in your tool's html file. You can copy the navbar from index.html.
- Add screenshot of your tool in, PR message and also in the folder of your tool
- Before Making the PR Pull the latest changes that have been made to the repository

**Note: Please Don't Make Any Changes In `index.html` AND `contributors.html` **
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## Add this to your pr message

## Title

## Number of files/folder added

## changes made

## I have;

- [ ] Read contibuting.md
- [ ] Followed all the guidelines
- [ ] updated readme.md