Created Using the library in a CMake project (markdown)

Using-the-library-in-a-CMake-project.md

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+All you need to write a `CMakeLists.txt` like this one:
+
+```CMake
+cmake_minimum_required(VERSION 2.8.12)
+project(Server)
+
+add_subdirectory(ArduinoJson/src)
+
+add_executable(server
+    server.c
+)
+
+target_link_libraries(server  ArduinoJson)
+```
+
+Then just call:
+
+```shell
+mkdir build
+cd build
+cmake ..
+make
+```
+
+See issue [#188](https://github.com/bblanchon/ArduinoJson/issues/188)