Initial port of the C++ version of the memory tutorial

A couple of things still need to be done though, including more sharing with
the Rust version, cmake syntax highlighting, externalizing the code.

docs/tutorial/cpp/src/SUMMARY.md

@@ -0,0 +1,11 @@
+# Summary
+
+- [Introduction](./introduction.md)
+- [Getting Started](./getting_started.md)
+- [Memory Tile](./memory_tile.md)
+- [Polishing the Tile](./polishing_the_tile.md)
+- [From One To Multiple Tiles](./from_one_to_multiple_tiles.md)
+- [Creating The Tiles From C++](./creating_the_tiles_from_cpp.md)
+- [Game Logic In C++](./game_logic_in_cpp.md)
+- [Ideas For The Reader](./ideas_for_the_reader.md)
+- [Conclusion](./conclusion.md)