Merge pull request #2 from dclark27/crcxwc

add database tables
connection example
Changed "BULL" to "NULL"

Changed "BULL" to "NULL"
Missing comma

Inserted a missing comma
Formatting: Removed Whitespace

Removed whitespace
Merge pull request #3 from dclark27/crcxwc

add card images
Added UNIQUE constraint to allGuess table

Since duplicate values shouldn't exist in the allGuess table, UNIQUE
constraints are added
Adding log in feature
fix 'user' reference