move main activity to subpackage

app/src/main/AndroidManifest.xml

@@ -9,7 +9,7 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
-        <activity android:name=".MainActivity">
+        <activity android:name=".activities.MainActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 

app/src/main/java/ch/ost/rj/mge/miniproject/tasktracker/MainActivity.kt → app/src/main/java/ch/ost/rj/mge/miniproject/tasktracker/activities/MainActivity.kt

-package ch.ost.rj.mge.miniproject.tasktracker
+package ch.ost.rj.mge.miniproject.tasktracker.activities
 
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import ch.ost.rj.mge.miniproject.tasktracker.R
 
 class MainActivity : AppCompatActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {

app/src/main/res/layout/activity_main.xml

@@ -4,7 +4,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    tools:context=".MainActivity">
+    tools:context=".activities.MainActivity">
 
     <TextView
         android:layout_width="wrap_content"