chore: import upstream snapshot with attribution

tools/templates/sample_project_cpp/CMakeLists.txt

@@ -0,0 +1,6 @@
+# The following five lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.22)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(main)

tools/templates/sample_project_cpp/main/CMakeLists.txt

@@ -0,0 +1,2 @@
+idf_component_register(SRCS "main.cpp"
+                    INCLUDE_DIRS ".")

tools/templates/sample_project_cpp/main/main.cpp

@@ -0,0 +1,6 @@
+#include <cstdio>
+
+extern "C" void app_main(void)
+{
+
+}