Restore projects/CMake/CMakeLists.txt (#5191)

For some reason, #5181 deleted it.
This project is intended to be a simple template to set up a project
consuming raylib with CMake.

projects/CMake/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.11) # FetchContent is available in 3.11+
+project(example)
+
+# Generate compile_commands.json
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+# Dependencies
+set(RAYLIB_VERSION 5.5)
+find_package(raylib ${RAYLIB_VERSION} QUIET) # QUIET or REQUIRED
+if (NOT raylib_FOUND) # If there's none, fetch and build raylib
+  include(FetchContent)
+  FetchContent_Declare(
+    raylib
+    DOWNLOAD_EXTRACT_TIMESTAMP OFF
+    URL https://github.com/raysan5/raylib/archive/refs/tags/${RAYLIB_VERSION}.tar.gz
+  )
+  FetchContent_GetProperties(raylib)
+  if (NOT raylib_POPULATED) # Have we downloaded raylib yet?
+    set(FETCHCONTENT_QUIET NO)
+    FetchContent_MakeAvailable(raylib)
+  endif()
+endif()
+
+# Our Project
+
+add_executable(${PROJECT_NAME} core_basic_window.c)
+#set(raylib_VERBOSE 1)
+target_link_libraries(${PROJECT_NAME} raylib)
+
+# Web Configurations
+if (${PLATFORM} STREQUAL "Web")
+    set_target_properties(${PROJECT_NAME} PROPERTIES SUFFIX ".html") # Tell Emscripten to build an example.html file.
+    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -s USE_GLFW=3 -s ASSERTIONS=1 -s WASM=1 -s ASYNCIFY -s GL_ENABLE_GET_PROC_ADDRESS=1")
+endif()
+
+# Checks if OSX and links appropriate frameworks (Only required on MacOS)
+if (APPLE)
+    target_link_libraries(${PROJECT_NAME} "-framework IOKit")
+    target_link_libraries(${PROJECT_NAME} "-framework Cocoa")
+    target_link_libraries(${PROJECT_NAME} "-framework OpenGL")
+endif()

projects/CMake/README.md

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+# raylib CMake Project
+
+This provides a base project template which builds with [CMake](https://cmake.org).
+
+## Usage
+
+To compile the example, use one of the following dependending on your build target...
+
+### Desktop
+
+Use the following to build for desktop:
+
+``` bash
+cmake -B build
+cmake --build build
+```
+
+### Web
+
+Compiling for the web requires the [Emscripten SDK](https://emscripten.org/docs/getting_started/downloads.html):
+
+``` bash
+mkdir build
+cd build
+emcmake cmake .. -DPLATFORM=Web -DCMAKE_BUILD_TYPE=Release -DCMAKE_EXECUTABLE_SUFFIX=".html"
+emmake make
+```

projects/CMake/core_basic_window.c

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+/*******************************************************************************************
+*
+*   raylib [core] example - Basic window (adapted for HTML5 platform)
+*
+*   This example is prepared to compile for PLATFORM_WEB and PLATFORM_DESKTOP
+*   As you will notice, code structure is slightly different to the other examples...
+*   To compile it for PLATFORM_WEB just uncomment #define PLATFORM_WEB at beginning
+*
+*   This example has been created using raylib 1.3 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2015 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+
+#if defined(PLATFORM_WEB)
+    #include <emscripten/emscripten.h>
+#endif
+
+//----------------------------------------------------------------------------------
+// Global Variables Definition
+//----------------------------------------------------------------------------------
+int screenWidth = 800;
+int screenHeight = 450;
+
+//----------------------------------------------------------------------------------
+// Module Functions Declaration
+//----------------------------------------------------------------------------------
+void UpdateDrawFrame(void);     // Update and Draw one frame
+
+//----------------------------------------------------------------------------------
+// Program main entry point
+//----------------------------------------------------------------------------------
+int main()
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    InitWindow(screenWidth, screenHeight, "raylib [core] example - basic window");
+
+#if defined(PLATFORM_WEB)
+    emscripten_set_main_loop(UpdateDrawFrame, 0, 1);
+#else
+    SetTargetFPS(60);   // Set our game to run at 60 frames-per-second
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        UpdateDrawFrame();
+    }
+#endif
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}
+
+//----------------------------------------------------------------------------------
+// Module Functions Definition
+//----------------------------------------------------------------------------------
+void UpdateDrawFrame(void)
+{
+    // Update
+    //----------------------------------------------------------------------------------
+    // TODO: Update your variables here
+    //----------------------------------------------------------------------------------
+
+    // Draw
+    //----------------------------------------------------------------------------------
+    BeginDrawing();
+
+        ClearBackground(RAYWHITE);
+
+        DrawText("Congrats! You created your first window!", 190, 200, 20, LIGHTGRAY);
+
+    EndDrawing();
+    //----------------------------------------------------------------------------------
+}