Update README

Detailed information about the app is added. The file type is also changed to .md
Add footer

A footer is now docked at the bottom of the page. The links are not currently working but they will be updated shortly.
Add photo container to homes#index template
Add CSS styling for homes#index template
Add site photos to .gitignore
Add image of lung caner survivor to home page
Import font for 'hero' div
Style 'hero' photo area

Add new font, image and links. Links are not currently functional.
Add logo to navigation bar
Add functionality to links

Donate, volunteer, and contact links now work. Additionally, a user is redirected to sign-up if not logged in and link on 'hero' photo is clicked
Upload one form of media at a time
Remove 'My Story' link
Separate 'add video' and 'add photo' options
Update user routing

Change 'resource :user' to resources :users