add arduino json lib

#182

lib/ArduinoJson/third-party/catch/CMakeLists.txt

@@ -0,0 +1,13 @@
+# ArduinoJson - arduinojson.org
+# Copyright Benoit Blanchon 2014-2018
+# MIT License
+
+add_library(catch
+	catch.hpp
+	catch.cpp
+)
+
+target_include_directories(catch
+	PUBLIC
+	${CMAKE_CURRENT_SOURCE_DIR}
+)

lib/ArduinoJson/third-party/catch/catch.cpp

@@ -0,0 +1,6 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#define CATCH_CONFIG_MAIN
+#include "catch.hpp"