Initial prototype

.clang-format

CMakeLists.txt

examples/CMakeLists.txt

examples/text/CMakeLists.txt

examples/text/main.cpp

ftxui/CMakeLists.txt

ftxui/include/ftxui/README.md

ftxui/include/ftxui/core/box.hpp

ftxui/include/ftxui/core/component.hpp

ftxui/include/ftxui/core/document.hpp

ftxui/include/ftxui/core/dom/elements.hpp

ftxui/include/ftxui/core/dom/node.hpp

ftxui/include/ftxui/core/requirement.hpp

ftxui/include/ftxui/core/screen.hpp

ftxui/include/ftxui/util/string.hpp

ftxui/src/ftxui/core/component.cpp

ftxui/src/ftxui/core/dom/flex.cpp

ftxui/src/ftxui/core/dom/hbox.cpp

ftxui/src/ftxui/core/dom/hbox_test.cpp

ftxui/src/ftxui/core/dom/node.cpp