Add build example in README.md

README.md

@@ -31,3 +31,47 @@ A C++ library for making text based user interface.
 ## Tutorial
 See [Tutorial](./tutorial.md)
 
+## Build using CMake
+~~~bash
+mkdir build
+cd build
+cmake ..
+make
+sudo make install
+~~~
+
+## Use library using CMake
+
+CMakeLists.txt
+~~~cmake
+cmake_minimum_required(VERSION 3.0)
+
+find_package(ftxui REQUIRED)
+add_executable(main main.cpp)
+target_link_libraries(main PUBLIC ftxui::dom)
+~~~
+
+main.cpp
+~~~cpp
+#include "ftxui/screen/screen.hpp"
+#include "ftxui/dom/elements.hpp"
+#include <iostream>
+
+int main(int argc, const char *argv[])
+{
+  using namespace ftxui::screen;
+  using namespace ftxui::dom;
+  auto document =
+    hbox(
+      text(L"left") | bold,
+      text(L"middle") | flex,
+      text(L"right")
+    ),
+  auto screen = Screen::TerminalOutput(document);
+  Render(screen, document.get());
+
+  std::cout << screen.ToString();
+
+  return 0;
+}
+~~~