Template Class with .hpp + .cpp

Do not contain Grid.cpp.

Test with C++20 with clang++-12.

 $ clang++-12 -lstdc++ -std=c++20 main.cpp Grid.hpp

I was referring to contents of Professional C++ Chapter 12.

So I modify the example a little by myself.

Name		Name	Last commit message	Last commit date
Latest commit History 3 Commits
.gitignore		.gitignore
Grid.cpp		Grid.cpp
Grid.hpp		Grid.hpp
LICENSE		LICENSE
README.md		README.md
main.cpp		main.cpp

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