Konstantin Podsvirov b567ffe7e0 Add CMake project
Export Dear ImGui as CMake's ImGui package.

Options:
- ImGui_USER_CONFIG;
- ImGui_EXAMPLES;
- ImGui_BACKENDS;
- ImGui_MISC;
- ImGui_3RDPARTY;
- ImGui_OPENGL_LOADER;
- ImGui_FREETYPE;
- ImGui_TOOLS;
- ImGui_PACKAGE.

Export targets:
- ImGui::Core;
- ImGui::ImplGLUT;
- ImGui::ImplSDL2;
- ImGui::ImplSDLRenderer2;
- ImGui::ImplSDL3;
- ImGui::ImplSDLRenderer3;
- ImGui::ImplGlfw;
- ImGui::ImplOpenGL2;
- ImGui::ImplOpenGL3;
- ImGui::ImplVulkan;
- ImGui::FreeType;
- ImGui::StdLib;
- ImGui::BinaryToCompressedC.

Import targets from:
- build directory;
- installed package.

Examples:
- example_null;
- example_glut_opengl2
- example_sdl2_sdlrenderer2;
- example_sdl2_opengl2;
- example_sdl2_opengl3;
- example_sdl2_vulkan;
- example_sdl3_sdlrenderer3;
- example_sdl3_opengl3;
- example_sdl3_vulkan;
- example_glfw_opengl2;
- example_glfw_opengl3;
- example_glfw_vulkan.

Presets:
- vcpkg (require $env{VCPKG_ROOT});
- emscripten (inherits vcpkg and require $env{EMSCRIPTEN_ROOT}).
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See BACKENDS and EXAMPLES files in the docs/ folder, or on the web at: https://github.com/ocornut/imgui/tree/master/docs

Backends = Helper code to facilitate integration with platforms/graphics api (used by Examples + should be used by your app).
Examples = Standalone applications showcasing integration with platforms/graphics api.

Some Examples have extra README files in their respective directory, please check them too!

Once Dear ImGui is running (in either examples or your own application/game/engine),
run and refer to ImGui::ShowDemoWindow() in imgui_demo.cpp for the end-user API.