docs: Starting to add Doxygen comments

Board.cpp

@@ -88,6 +88,22 @@ void Board::setupInitialPosition() {
     }
     return;
 }
+/**
+ * Sets entire board to nullptr
+ */
+void Board::clearBoard() {
+    for(int i = 0; i < 8; i++) {
+        for(int j = 0; j < 8; j++) {
+            boardGrid[i][j] = nullptr;
+        }
+    }
+}
+
+/**
+ * Takes a FEN string and creates a board to that spec
+ * @param strFEN A full FEN string
+ * @return Returns -1 on failure, 0 on success
+ */
 
 int Board::setupFromFEN(std::string strFEN) {
     std::vector<std::string> splitFEN = split(strFEN, ' ');
@@ -269,6 +285,18 @@ int Board::setupFromFEN(std::string strFEN) {
     return 0;
 }
 
+void Board::nextTurn() {
+    playerTurn = (playerTurn == PL_WHITE) ? PL_BLACK : PL_WHITE; // switch to other player's turn
+    // do initial checks -- is their king in check? do they have any legal moves?
+    // stalemate check - do we really need to call getLegalMoves() on every single Piece?
+}
+
+/**
+ * This function should only be called after you have confirmed the move is legal!
+ * This will execute the move and assume you've already checked it.
+ * @param from The Square on which the Piece is departing
+ * @param to The Square to which the Piece is moving to
+ */
 void Board::movePiece(Square from, Square to) {
     return;
 }