c++: file_read_write

README.adoc

@@ -13540,6 +13540,8 @@ Programs under link:userland/cpp/[] are examples of https://en.wikipedia.org/wik
 ** link:userland/cpp/template.cpp[]: basic example
 ** link:userland/cpp/template_class_with_static_member.cpp[]: https://stackoverflow.com/questions/3229883/static-member-initialization-in-a-class-template
 ** link:userland/cpp/if_constexpr.cpp[]: C++17 `if constexpr`
+* fstream
+** link:userland/cpp/file_write_read.cpp[]
 
 [[cpp-multithreading]]
 ==== C++ multithreading