Image-upload

[samutru]

To do

• [x] Unique filename must be provided while uploading an img.
• [x] Filter by createdAt
• [x] Copy only element

Testing

• [x] Verify that single/multiple image uploads are possible
• [x] Verify that all images are displayed for the logged-in user
• [x] Verify that the image is stored in the correct path in fs
• [x] Verify that the image with correct data is stored in db
• [x] Verify that wrong file types get rejected
• [x] Verify that duplicates get rejected
• [x] Verify that if the user table gets dropped all corresponding images get deleted as well
• [x] Verify that images can be deleted (deletes record in db and also in fs)