Add default role Instructor and Students (manually add)

state.py

@@ -42,7 +42,7 @@ def init_session_state():
         "results":          {},   # {filename: (annotations, totalSeconds)}
         "speakerRenames":   {},   # {filename: {speaker: name}}
         "summaries":        {},   # {filename: {df2, df3, ...}}
-        "categories":       [],
+        "categories":       ["Instructor", "Students"],
         "categorySelect":   {},   # {filename: [[], [], ...]}
         "removeCategory":   None,
         "resetResult":      False,