write function to check if word is user added
create a generic function that inputs word predictions
create a function to update user added word frequencies
add code to increase user added word frequencies when user selects them
add code to set user added word starting frequency on start up
add code to halve user added word frequencies when 10 are above or equal to 100
Merge pull request #199 from OwenMcGirr/iss#153

User frequency adaptation