docs(twenty-forty-eight): add new subject and audit

for DEV-4108

subjects/mobile-dev/twenty-forty-eight/README.md

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+## twenty-forty-eight
+
+### Introduction:
+
+Let us imagine that today is the april of 2014 and we know that the game "2048" is not implemented yet, but will be within a month. As we are aware the game will be a success and it is not such a difficult project to implement. Your task is to implement the game before the author of the game does so.
+
+The game shoud start with a 4x4 table. Every new tile must be valued as either 2 or 4. Start game with 3-4 tiles, which are located randomly on the board. By swiping, tiles are moved towards any of 4 directions as far as possible and if there are two tiles that collide with the same value, they merge into one tile with twice the value, and as a result, the score is updated.
+After each move, new tile appears randomly in an empty slot.
+You must retain the best score. Score is attained when tiles are merged, i.e. if tiles with a value of 4 are merged, add 4 to current score.
+
+You can use colors of your choice, but colors of the original game are preferred.
+
+Use any [animation](https://docs.flutter.dev/development/ui/widgets/animation) tile movement.
+
+Game should stop when no legal movement is possible, and let user restart game. When game is over, update the best score if it is required.
+
+<center>
+
+<img src="https://github.com/alem-01/alem_public/blob/master/resources/2048.01.png?raw=true" style = "width: 840px !important; height: 420px !important;"/>
+
+</center>

subjects/mobile-dev/twenty-forty-eight/audit/README.md

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+#### Functional
+
+> In order to run and hot reload app either on emulator or device, follow the [instructions](https://docs.flutter.dev/get-started/test-drive?tab=androidstudio#run-the-app)
+
+###### Was the app committed within the required time period?
+
+###### Does the app run without crashes?
+
+###### Play the game for a while. Do tiles move when you swipe the screen?
+
+###### Do tiles with the same value merge into a single tile with double the value?
+
+###### When swiped, do tiles move all the way to the swiped direction? They must stop only if edge of the grid or other tile is encountered.
+
+###### Is the tile movement animated?
+
+###### Try beating best score of the game. After game is over, is the best score updated?