Model View Architecture?

added DiaryController class for user interface.
Concerns separated.
tests.

README.md

@@ -1,6 +1,7 @@
 # Diary
 The diary app is intended to be called from a command prompt and can be used to quickly log entries of your day and search for past entries.
-The read option enables you to replay entries the way you typed it into the console.
+The read option enables you to replay entries the way you typed it into the console.  
+The setup is quite clumsy for a standalone script.
 
 After having added the .py extension and the program directory to path, the Diary interface could be called with one of three ways to start it up.
 
@@ -31,3 +32,7 @@ After having added the .py extension and the program directory to path, the Diar
 >diary [searchall | findall]  [ string [ string2 [...]]]
 >```
 >helps you search for strings in your file. The ```searchall / findall``` also works in a similar fashion except that it fetches those entries that simultaneously have all the search strings in it.
+
+The `DiaryController` class is responsible for handling user interaction to access the `Diary`.  
+The `Diary` class contains a list of `Entry` instances that contain a record of the user's input.
+