Create Card model to store card data.

[zachwlewis]

We need a model to represent a basic card. Not sure what all data we currently need for cards, but this should get us started.

• [x] Card Title
• [x] Card Type (acting, stealth, social, et cetera)
• [x] Card Description
• [x] Flavor Text
• [x] Has the card been viewed?

[Br4ndong]

Has the card been viewed will be closed with issues #2 and #4