Add profile picture to website

[ivanzvonkov]

Context: We are beginning to use our github.io website more actively: https://nasaharvest.github.io/
Issue: There's no profile picture for you
To do:

1. Clone repository locally
2. Create a new branch by running git checkout -b <your-name>-profile
3. Add a square image (under 200 KB) of yourself into profiles/ the (image name should be your last name)
4. Update the code associated with your name in index.html from

<img src="assets/logo.png" class="emptyprofile"/>

to

<img src="profiles/<your-last-name>.jpg" class="profile">

5. Check that it worked by opening index.html in a web browser
6. Push the code to your branch

git add . 
git commit -m'Added profile picture for <your name>'
git push

7. Create a new Pull request and add me as a reviewer