How to add custom library in nRFConnect in VSCode?

Question

I added a custom library 
 As seen it is detected by the vscode intellisense or autosuggest? And still shows undefined in compilation Is their anything I should add in cmake or config or folder structure problem? TIA

xproto · Accepted Answer

Fixed it, need to add in CmakeLists.txt. #
# Copyright (c) 2018 Nordic Semiconductor
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
#
cmake_minimum_required(VERSION 3.20.0)

find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
project(NONE)

# NORDIC SDK APP START
target_sources(app PRIVATE
 src/main.c
 lib/analog_read.c
)

# Include UART ASYNC API adapter
target_sources_ifdef(CONFIG_BT_NUS_UART_ASYNC_ADAPTER app PRIVATE
 src/uart_async_adapter.c
)

# NORDIC SDK APP END

zephyr_library_include_directories(.)