created class Suggestion.java

Suggestion.java has two attributes:
name (String) and selected (Boolean)
There are also methods to set and retrieve those variables

The class is used to make the checkbox list in
SuggestionsForImprovement.java
altered our list adapter to allow checkboxes

created a new layout file, edited the manifest, and implemented the
Suggestion class in SuggestionsForImprovement.java to create an array
adapter that populates a view with checkboxes.