docs: add initial project documentation

src/CMakeLists.txt

@@ -0,0 +1,6 @@
+# This file was automatically generated for projects
+# without default 'CMakeLists.txt' file.
+
+FILE(GLOB_RECURSE app_sources ${CMAKE_SOURCE_DIR}/src/*.*)
+
+idf_component_register(SRCS ${app_sources})

src/main.c

@@ -0,0 +1 @@
+void app_main() {}