Initial commit, import skeleton structure

.gitignore

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+sdkconfig
+build
+wifi_credentials.h

CMakeLists.txt

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+# The following lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.5)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(esp8266-clock)

main/CMakeLists.txt

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