Added Solution - GfG to GitHub

Create README - GfG to GitHub

Added Solution - GfG to GitHub

Create README - GfG to GitHub

Create MaximumSumBSTBinaryTree.cpp

Create SumTree.cpp

Create MirrorTree.cpp

Update SequentialDigits.cpp

Create SequentialDigits.cpp

Create SmallestNumberOnLeft.cpp

Update MaximumRectangularAreaInHistogram.cpp

Create MaximumRectangularAreaInHistogram.cpp

Update WordBoggle.cpp

Create WordBoggle.cpp

Create StronglyConnectedComponents.cpp