Added FetchContent integration example

Author: baderouaich

integration_tests/cpm/Readme.md integration_tests/cpm/README.mdintegration_tests/cpm/Readme.md renamed to integration_tests/cpm/README.md

@@ -0,0 +1,17 @@
+cmake_minimum_required(VERSION 3.10)
+project(demo_fc)
+
+set(CMAKE_CXX_STANDARD 17) # C++17 or newer is required
+
+include(FetchContent)
+FetchContent_Declare(BitmapPlusPlus
+        GIT_REPOSITORY "https://github.com/baderouaich/BitmapPlusPlus"
+        GIT_TAG "master"
+)
+FetchContent_MakeAvailable(BitmapPlusPlus)
+
+add_executable(${PROJECT_NAME}
+        "${CMAKE_CURRENT_SOURCE_DIR}/Main.cpp"
+)
+
+target_link_libraries(${PROJECT_NAME} LINK_PRIVATE bmp::BitmapPlusPlus)

integration_tests/fetchcontent/CMakeLists.txt

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+#include <BitmapPlusPlus.hpp>
+
+int main()
+{
+    bmp::Bitmap bitmap(512, 512);
+    for (auto& pixel : bitmap)
+    {
+        pixel = bmp::Pixel(42, 69, 96);
+    }
+
+    bitmap.save("demo.bmp");
+}

integration_tests/fetchcontent/Main.cpp

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+# Integration example using CPM
+
+CPM stands for [CMake Package Manager](https://github.com/cpm-cmake) which is a convenience wrapper over CMake's
+FetchContent module. You can download the CPM.cmake from the
+project [releases page](https://github.com/cpm-cmake/CPM.cmake/releases/latest).
+
+With CPM enabled, you can bring this library in using the following command:
+
+```
+CPMAddPackage ( "gh:baderouaich/BitmapPlusPlus#master" )
+```
+
+And link it to your target using:
+
+```
+target_link_libraries( ${TARGET} LINK_PRIVATE bpp::BitmapPlusPlus )
+```
+
+Note that your target needs to compile with C++17 or newer. After that, you can simply include the library in your code:
+
+```cpp
+#include <BitmapPlusPlus.hpp>
+```