index.html : Added my name, Snehal Gupta

[snehalgupta]

My name was added in the HTML file as a part of Arche Contributors
Closes #15

[madhur-tandon]

Hey, It seems like you did not create an issue for yourself as written in the guide and also, You referenced issue #8 while submitting a PR.

To fix this, Kindly do the following :)

1. Create an issue with title as snehalgupta as mentioned in the guide.
2. The PR looks fine, however the commit message needs to be changed to refer the new issue,
   To do this, simply type git commit --amend, after your editor pops up, please refer to the new issue you just created. After this is done, use git push -f origin snehalgupta to force push your changes :)

[snehalgupta]

Okay done :)