add::CMakeLists.txt

-add cmake file for main file
-add cmake file for temperature module
-add cmake file for uart module

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.13)
+
+# initialize the SDK directly
+include(pico_sdk_import.cmake)
+
+project(RASPBERRY_PI_PICO_TEMPERATURE)
+
+# initialize the Raspberry Pi Pico SDK
+pico_sdk_init()
+
+add_compile_options(-Wall
+    -Werror
+)
+
+# rest of your project
+add_executable(main
+    main.c
+)
+
+add_subdirectory(temperature)
+add_subdirectory(uart)
+
+# Add pico_stdlib library which aggregates commonly used features
+target_link_libraries(main pico_stdlib temperature uart)
+
+
+# create map/bin/hex/uf2 file in addition to ELF.
+pico_add_extra_outputs(main)

temperature/CMakeLists.txt

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+file(GLOB FILES *.c *.h)
+
+add_library(temperature ${FILES})
+
+target_link_libraries(temperature pico_stdlib)

uart/CMakeLists.txt

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+file(GLOB FILES *.c *.h)
+
+add_library(uart ${FILES})
+
+target_link_libraries(uart pico_stdlib)