Add simple example built with CMake

examples/cmake_simple/CMakeLists.txt

@@ -0,0 +1,17 @@
+cmake_minimum_required(VERSION 2.8.12)
+project(NANOPB_CMAKE_SIMPLE C)
+
+set(NANOPB_SRC_ROOT_FOLDER ${CMAKE_CURRENT_SOURCE_DIR}/../..)
+set(CMAKE_MODULE_PATH ${NANOPB_SRC_ROOT_FOLDER}/extra)
+find_package(Nanopb REQUIRED)
+include_directories(${NANOPB_INCLUDE_DIRS})
+
+nanopb_generate_cpp(PROTO_SRCS PROTO_HDRS simple.proto)
+include_directories(${CMAKE_CURRENT_BINARY_DIR})
+#add_custom_target(generate_proto_sources DEPENDS ${PROTO_SRCS} ${PROTO_HDRS})
+set_source_files_properties(${PROTO_SRCS} ${PROTO_HDRS}
+    PROPERTIES GENERATED TRUE)
+
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Werror -g -O0")
+
+add_executable(simple simple.c ${PROTO_SRCS} ${PROTO_HDRS})