Updated CMakeLists.txt to support esp-idf

CMakeLists.txt

@@ -1,3 +1,4 @@
+if(NOT IDF_TARGET STREQUAL "esp32")
 cmake_minimum_required(VERSION 3.1...3.18)
 
 # Fallback for using newer policies on CMake <3.12.
@@ -391,3 +392,9 @@ if (FMT_MASTER_PROJECT AND EXISTS ${gitignore})
   set(CPACK_RESOURCE_FILE_README ${PROJECT_SOURCE_DIR}/README.rst)
   include(CPack)
 endif ()
+else()
+idf_component_register(
+    INCLUDE_DIRS
+        include
+)
+endif()