Add missing AP classes -- Coming soon page

[feross]

From Twitter:

@NedrickHaye: @StudyNotesApp Open Up the opportunity for people to submit notes for classes that are not listed. Like AP Chem and the others you list.

• [ ] AP Art History
• [ ] AP Biology (AP Bio)
• [ ] AP Calculus (AB & BC)
• [ ] AP Chemistry (AP Chem)
• [ ] AP Chinese Language and Culture
• [ ] AP Comparative Government & Politics
• [ ] AP Computer Science A
• [ ] AP Environmental Science
• [ ] AP French Language and Culture
• [ ] AP German Language and Culture
• [ ] AP Human Geography
• [ ] AP Italian Language and Culture
• [ ] AP Japanese Language and Culture
• [ ] AP Latin
• [ ] AP Macroeconomics (AP Econ)
• [ ] AP Music Theory
• [ ] AP Physics (B & C)
• [ ] AP Spanish Language
• [ ] AP Spanish Literature and Culture
• [ ] AP Statistics (AP Stats)
• [ ] AP Studio Art