Adding inference application for ThreadX

Change-Id: Icadb4ceb50997a31bafa2356bfa434568c056593
diff --git a/applications/CMakeLists.txt b/applications/CMakeLists.txt
index a0442c8..1c8d2a7 100644
--- a/applications/CMakeLists.txt
+++ b/applications/CMakeLists.txt
@@ -24,6 +24,8 @@
 
 add_subdirectory(hello_world)
 
+add_subdirectory(threadx_demo)
+
 if (CMAKE_CXX_COMPILER_ID STREQUAL "ARMClang")
     # Only armclang supported for now
     add_subdirectory(trustzone_inference)