adding board methods and board unit test

src/board.py

@@ -1,5 +1,35 @@
+import numpy as np
+
 class Board:
     def __init__(self, nbrow, nbcol):
         self.nbrow = nbrow
         self.nbcol = nbcol
+        self.board = np.zeros((nbrow, nbcol))
+    
+    def check_boundaries(self, row, col):
+        try:
+            self.board[row, col]
+            return True
+        except:
+            return False
+
+    def remove_piece(self, row, col):
+        self.board[row, col] = 0
+    
+    def insert_piece(self, row, col, player_id):
+        self.board[row, col] = player_id
+    
+    def insert_piece_into_column(self, col, player_id):
+        if player_id <= 0:
+            return False
+        if not self.check_boundaries(0, col):
+            return False
+
+        indices = np.where(self.board[:, col] == 0)[0]
+        if indices.size > 0:
+            row = indices[0]
+            self.insert_piece(row, col, player_id)
+            return True
+        else:
+            return False