Add CMakeLists.txt to support cmake build system (ESP-IDF v3.2).

CMakeLists.txt

@@ -0,0 +1,9 @@
+# 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 3.5)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(esp32-ds18b20-example)
+
+# Ignore false clang warnings about `struct foo = { 0 }`
+target_compile_options(main PRIVATE -Wno-missing-braces -Wmissing-field-initializers)

components/esp32-ds18b20

@@ -1 +1 @@
-Subproject commit 7a57590902f5bdee6ead0a6fc6552fd9f3fc0fe6
+Subproject commit 331cadf2e25c004b5506d329979ac3f7d4998a5d

components/esp32-owb

@@ -1 +1 @@
-Subproject commit 8c04d3b57be7b0ed734cbebf07c47f5575aa8613
+Subproject commit de012fd1deeb9aff194bc8e32e1dee725258c022

main/CMakeLists.txt

@@ -0,0 +1,4 @@
+set(COMPONENT_SRCDIRS ".")
+set(COMPONENT_ADD_INCLUDEDIRS ".")
+
+register_component()