Update README.md with promo images and .exe info

Author: Jonqora

README.md

@@ -1,4 +1,4 @@
-# racket-sudoku
+# Smooth Sudoku
 Playable sudoku client written as a HtDW world program in Racket ISL
 
 --------------------------------------------------------------------------------
@@ -17,18 +17,34 @@ algorithm using constraint sets. Redesigning the data types and functions this
 way allowed the new algorithm to become much more efficient. 
 
 3. For this current project after term ended, I designed and built a fully 
-playable sudoku game GUI that employs the constraint set solver algorithm. My 
-full game includes several features that make use of the algorithm's constraint 
-sets (e.g. autosolve mode, hint system, error tracking, option display...)
+playable sudoku game GUI that employs multiple variations on the constraint 
+set solver algorithm. My full game includes several features that make use of 
+the algorithm's constraint sets (e.g. autosolve mode, hint system, error 
+tracking, option display...)
+
+## Features
+
+<img src="/promo/image-new-hover-mouse.png" alt="Smooth Sudoku interface: new game and hover-to-play" title="New game" width="500"/>
+
+<img src="/promo/image-errors-undo.png" alt="Smooth Sudoku features: show errors and undo" title="Undo/Show Errors" width="500"/>
+
+<img src="/promo/image-hint-choices.png" alt="Smooth Sudoku interface: hints and show choices" title="Hint/Show Choices" width="500"/>
+
+<img src="/promo/image-winner.png" alt="Smooth Sudoku interface: autosolve and win screen" title="Autosolve" width="500"/>
+
 
 ## User Information
 ### COMPATIBILITY
-- DrRacket 8.1;
+#### To run from source code:
+- DrRacket 8.1+;
 - Language: Intermediate Student with lambda
 
-### INSTALLATION
-- [Install the latest version of DrRacket.](https://racket-lang.org/)
-- Use menu `Language` -> `Choose Language...` and select "Intermediate Student with lambda".
+_**HOW TO INSTALL:**_ Install the latest version of [DrRacket.](https://racket-lang.org/). Download and open the [`play.racket.rkt`](/play-sudoku.rkt) source file in DrRacket, then run the program using the DrRacket IDE.
+
+#### To run .exe release file:
+- Windows 10+
+
+_**HOW TO INSTALL:**_ Download the latest .exe release from [this repo folder](/play-sudoku/), then run the application.
 
 ### USING THE PROGRAM
-- Run the program; the game interface window will appear. Interact with it using the mouse.
+- On running the program, the game interface window will appear. Interact with it using the mouse.