add readme

README.md

@@ -1,16 +1,87 @@
-# tictactoe
+# Tic Tac Toe
+
+Tic Tac Toe is a Flutter apllication which is made using BackTracking MinMax algorithm.
+
+# MinMax algorithm:
+
+1) Finding the Best Move :
+
+We shall be introducing a new function called findBestMove(). This function evaluates all the available moves using minimax() and then returns the best move the maximizer can make. The pseudocode is as follows : 
+
+  function findBestMove(board):
+    bestMove = NULL
+    for each move in board :
+        if current move is better than bestMove
+            bestMove = current move
+    return bestMove
+
+
+2)  Minimax :
+
+To check whether or not the current move is better than the best move we take the help of minimax() function which will consider all the possible ways the game can go and returns the best value for that move, assuming the opponent also plays optimally 
+The code for the maximizer and minimizer in the minimax() function is similar to findBestMove() , the only difference is, instead of returning a move, it will return a value. Here is the pseudocode : 
+
+
+function minimax(board, depth, isMaximizingPlayer):
+
+    if current board state is a terminal state :
+        return value of the board
+
+    if isMaximizingPlayer :
+        bestVal = -INFINITY 
+        for each move in board :
+            value = minimax(board, depth+1, false)
+            bestVal = max( bestVal, value) 
+        return bestVal
+
+    else :
+        bestVal = +INFINITY 
+        for each move in board :
+            value = minimax(board, depth+1, true)
+            bestVal = min( bestVal, value) 
+        return bestVal
+
+## Application ScreenShots
+
+# Splash Screen
+![Screenshot_2021-05-27-23-54-28-472_com android chrome](https://user-images.githubusercontent.com/47409900/119878547-e3c73a80-bf47-11eb-9801-a1ccc8f68221.jpg)
+
+# Home Page
+
+![Screenshot_2021-05-27-23-54-33-176_com android chrome](https://user-images.githubusercontent.com/47409900/119879319-baf37500-bf48-11eb-9686-8e761b21a120.jpg)
+
+# Game Play
+
+![Screenshot_2021-05-27-23-54-45-109_com android chrome](https://user-images.githubusercontent.com/47409900/119879421-db233400-bf48-11eb-9cea-2fee4717e59c.jpg)
+![Screenshot_2021-05-27-23-54-53-518_com android chrome](https://user-images.githubusercontent.com/47409900/119879449-e1b1ab80-bf48-11eb-9f9a-d4b7a7f8c30e.jpg)
+![Screenshot_2021-05-27-23-54-57-093_com android chrome](https://user-images.githubusercontent.com/47409900/119879468-e6765f80-bf48-11eb-9de6-65c122ad1338.jpg)
+![Screenshot_2021-05-27-23-55-14-871_com android chrome](https://user-images.githubusercontent.com/47409900/119879486-ea09e680-bf48-11eb-96dd-2c907173924a.jpg)
+
+
+# Winner Show
+
+![Screenshot_2021-05-27-23-56-38-979_com android chrome](https://user-images.githubusercontent.com/47409900/119879612-09a10f00-bf49-11eb-9da7-f2f4717e380a.jpg)
+![Screenshot_2021-05-27-23-55-59-683_com android chrome](https://user-images.githubusercontent.com/47409900/119879636-0e65c300-bf49-11eb-9bde-fbede2e5fd9b.jpg)
+![Screenshot_2021-05-27-23-58-02-442_com android chrome](https://user-images.githubusercontent.com/47409900/119879662-158cd100-bf49-11eb-90ac-0796ad944bad.jpg)
+![Screenshot_2021-05-27-23-58-22-736_com android chrome](https://user-images.githubusercontent.com/47409900/119879679-1887c180-bf49-11eb-83fe-239ff17fe5f9.jpg)
+
+
+
+## Thank You
+
+
+
+
+
+
+
+
+
+
+
 
-tic tac toe by souvik
 
-## Getting Started
 
-This project is a starting point for a Flutter application.
 
-A few resources to get you started if this is your first Flutter project:
 
-- [Lab: Write your first Flutter app](https://flutter.dev/docs/get-started/codelab)
-- [Cookbook: Useful Flutter samples](https://flutter.dev/docs/cookbook)
 
-For help getting started with Flutter, view our
-[online documentation](https://flutter.dev/docs), which offers tutorials,
-samples, guidance on mobile development, and a full API reference.