structure: made a src folder and moved all source file into it

src/game.nim

@@ -0,0 +1,29 @@
+from strutils import parseInt
+import rdstdin
+
+import ./chess
+
+proc runGame*(): void =
+  ## Initializes and runs a game of chess.
+  var game = initGame()
+  var draw: string
+  game.echoBoard(game.toMove)
+  while not game.isCheckmate(game.toMove) and not game.isStalemate(game.toMove):
+    echo "Make a move"
+    echo game.toMove
+    var move = readLine(stdin)
+    while not game.checkedMove(notationToMove(move, game.toMove)):
+      move = readLine(stdin)
+    game.echoBoard(game.toMove)
+    if (game.isDrawClaimable):
+      echo "Do you want to claim a draw? (y/N)"
+      draw = readLine(stdin)
+      if (draw == "y"):
+        echo "Draw claimed"
+        break
+  if game.isCheckmate(game.toMove):
+    echo $game.toMove & " was checkmated"
+  if game.isStalemate(game.toMove):
+    echo "Stalemate"
+
+runGame()