Add imgui

imgui-submodule/imgui/examples/.gitignore

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+build/*
+*/Debug/*
+*/Release/*
+*/x64/*
+*.o
+*.obj
+*.exe
+
+## Visual Studio cruft
+.vs/*
+*/ipch/*
+*.opensdf
+*.log
+*.pdb
+*.ilk
+*.user
+*.sdf
+*.suo
+*.VC.db
+*.VC.VC.opendb
+
+## Xcode cruft
+.DS_Store
+project.xcworkspace
+xcuserdata
+
+## Emscripten output
+*.o.tmp
+*.out.js
+*.out.wasm
+example_emscripten/example_emscripten.*
+
+## Unix executables
+example_glfw_opengl2/example_glfw_opengl2
+example_glfw_opengl3/example_glfw_opengl3
+example_glut_opengl2/example_glut_opengl2
+example_null/example_null
+example_sdl_opengl2/example_sdl_opengl2
+example_sdl_opengl3/example_sdl_opengl3
+
+## Dear ImGui Ini files
+imgui.ini
+
+## JetBrains IDEs
+.idea
+cmake-build-*