1. What type of code goes into the ui object?
2. What type of code goes into the server object?
3. Describe the correspondence between HTML tags and shiny functions
4. Where can you put code to have it run just once, when you launch your app?
5. What is reactivity in shiny? What does it accomplish for you?
6. What is your current working directory? Please use code to show me in your Rmd.