New endpoint discovered (Add course)

This checks that you can add it
```
https://one.uf.edu/api/myschedule/term/2188/section/2555/add-check
```
**This actually adds it**
```
https://one.uf.edu/api/myschedule/term/2188/section/2555/add
```
Request payload
```
{"credits":3,"classNumber":12109,"gradBasis":"GRD","acadCareer":"UGRD"}
```