Add: basic esp idf project skeleton

src/CMakeLists.txt

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+# For more information about build system see
+# https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/build-system.html
+# 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 3.16)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(esp32_eurorack_generic)

src/main/CMakeLists.txt

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+idf_component_register(SRCS "esp32_eurorack_generic.c"
+                    INCLUDE_DIRS ".")

src/main/esp32_eurorack_generic.c

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+#include <stdio.h>
+
+void app_main(void)
+{
+
+}