To do this exercise,

1. create a fork of this repo
2. add code as explained below
3. submit the link to this repo to the assignments email address
4. give a subject of this repo's name and the version number

• follow the comments and create code to complete it.
• Uploadhandler will check for file type match, file size, and existing file
-PHP functions will likely include:
• mysqli_connect
• mysqli_query
• json_encode
• pathinfo
• strlen
• empty
• isset
• move_uploaded_file
• file_exists
• in_array
• session_start
• session_destroy