add arduino json lib

#182

lib/ArduinoJson/test/StaticJsonBuffer/CMakeLists.txt

@@ -0,0 +1,16 @@
+# ArduinoJson - arduinojson.org
+# Copyright Benoit Blanchon 2014-2018
+# MIT License
+
+add_executable(StaticJsonBufferTests 
+	alloc.cpp
+	createArray.cpp
+	createObject.cpp
+	parseArray.cpp
+	parseObject.cpp
+	size.cpp
+	startString.cpp
+)
+
+target_link_libraries(StaticJsonBufferTests catch)
+add_test(StaticJsonBuffer StaticJsonBufferTests)