feat(main-v2): 메인 하단 내비게이션을 추가한다

app/src/main/AndroidManifest.xml

@@ -111,6 +111,7 @@
             </intent-filter>
         </activity>
         <activity android:name=".main.MainActivity" />
+        <activity android:name=".v2.main.MainV2Activity" />
         <activity android:name=".user.login.LoginActivity" />
         <activity android:name=".audio_content.all.AudioContentAllActivity" />
         <activity android:name=".settings.language.LanguageSettingsActivity" />