add SecondFragment

fragment_second.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white">

    <TextView
        android:id="@+id/textview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Second Activity"
        android:textSize="24sp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

SecondFragment.kt

package com.ascedncorp.androidbasic

import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.fragment.app.Fragment
import com.ascedncorp.androidbasic.databinding.FragmentMainBinding
import com.ascedncorp.androidbasic.databinding.FragmentSecondBinding

class SecondFragment: Fragment() {

    private lateinit var binding: FragmentSecondBinding

    companion object {
        const val EXTRA_TEXT = "SecondFragment:EXTRA_TEXT"

        fun newInstance(text: String) = SecondFragment().apply {
            arguments = Bundle().apply {
                putString(EXTRA_TEXT, text)
            }
        }
    }

    private val text by lazy {
        arguments?.getString(EXTRA_TEXT)
    }

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?,
    ): View {
        binding = FragmentSecondBinding.inflate(inflater, container, false)
        return binding.root
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        binding.textview.text = text
    }
}