Setup photo upload

[baileymeredith]

Some Notes for this PR: The file upload in post-review.ejs works and is linked to the database!

• I installed multer to help handle this type of form data; when you update your local repos you'll probably need to run npm install or npm rebuild
• I created a testing route ('/test') which can be deleted later but shows how I was passing the image field from the database to the file image.ejs (which is also a test file and can be deleted later).

Here's how I ended up implementing the upload functionality:

1. I got the image buffer from the form in post-reviews.ejs and saved it to an /images folder in public
2. I used the image buffer to write a new .jpg file into images folder
3. Edited the path information so that the frontend is able to access the image just by saying something along these lines from the database: res.render('image', {image: response.photo})

Future Implementation:

• It's pretty redundant to be saving both the image buffer and .jpg in the images folder, but it's how I was able to get this working for now
• I wanted to edit this to automatically crop the image being uploaded too so it's easier to handle on the frontend, but figured we can save this for a later step