Initial commit: MT firmware project

- BLE peripheral applications
- dr_piezo and bladder_patch projects

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

external/mbedtls/programs/util/CMakeLists.txt

@@ -0,0 +1,13 @@
+set(libs
+    mbedtls
+)
+
+add_executable(strerror strerror.c)
+target_link_libraries(strerror ${libs})
+
+add_executable(pem2der pem2der.c)
+target_link_libraries(pem2der ${libs})
+
+install(TARGETS strerror pem2der
+        DESTINATION "bin"
+        PERMISSIONS OWNER_READ OWNER_WRITE OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE)