Add an apps directory, and a json_parse program to parse an input file and report on memory usage.

This is intended to provide a way, during development, to test out the memory
and performance impacts of a change.

apps/CMakeLists.txt

@@ -0,0 +1,11 @@
+
+# Note: it is intentional that there are no install instructions here yet.
+# When/if the interface of the app(s) listed here settles down enough to
+# publish as part of a regular build that will be added.
+
+add_executable(json_parse json_parse.c)
+#target_compile_definitions(json_parse PRIVATE TEST_FORMATTED=1)
+target_link_libraries(json_parse PRIVATE ${PROJECT_NAME})
+
+include_directories(PUBLIC ${CMAKE_SOURCE_DIR})
+