Write a plugin with menu and basic setting page in wordpress

<?php
/*
Plugin Name: My Custom Plugin
Description: A basic plugin that adds a menu and a settings page
Version: 1.0
*/

function my_custom_plugin_menu() {
    add_menu_page(
        'My Custom Plugin',
        'My Custom Plugin',
        'manage_options',
        'my-custom-plugin',
        'my_custom_plugin_settings_page',
        'dashicons-admin-generic',
        20
    );
}
add_action( 'admin_menu', 'my_custom_plugin_menu' );

function my_custom_plugin_settings_page() {
    ?>
    <div class="wrap">
        <h1>My Custom Plugin Settings</h1>
        <form method="post" action="options.php">
            <?php
            settings_fields( 'my-custom-plugin-settings-group' );
            do_settings_sections( 'my-custom-plugin-settings-group' );
            submit_button();
            ?>
        </form>
    </div>
    <?php
}

function my_custom_plugin_settings() {
    register_setting( 'my-custom-plugin-settings-group', 'my_custom_plugin_option_name' );
    add_settings_section( 'my-custom-plugin-settings-section', 'My Custom Plugin Settings', 'my_custom_plugin_settings_section_callback', 'my-custom-plugin-settings-group' );
    add_settings_field( 'my_custom_plugin_field_name', 'Field Name', 'my_custom_plugin_field_name_callback', 'my-custom-plugin-settings-group', 'my-custom-plugin-settings-section' );
}
add_action( 'admin_init', 'my_custom_plugin_settings' );

function my_custom_plugin_settings_section_callback() {
    echo 'Enter your settings below:';
}

function my_custom_plugin_field_name_callback() {
    $setting = esc_attr( get_option( 'my_custom_plugin_option_name' ) );
    echo '<input type="text" name="my_custom_plugin_option_name" value="' . $setting . '" />';
}

This is just a basic example, you can add more fields, settings, and customize it according to your requirement.