added Update notification and button to download from Website

app/build.gradle

@@ -10,8 +10,8 @@ android {
         applicationId "de.joel.zoomhelper"
         minSdkVersion 21
         targetSdkVersion 30
-        versionCode 1
-        versionName '0.4.4'
+        versionCode 9
+        versionName '0.4.5'
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
@@ -28,6 +28,12 @@ android {
     }
 }
 
+repositories {
+    maven {
+        url "https://jitpack.io"
+    }
+}
+
 dependencies {
 
     implementation 'androidx.appcompat:appcompat:1.2.0'
@@ -37,4 +43,5 @@ dependencies {
     androidTestImplementation 'androidx.test.ext:junit:1.1.2'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
     implementation 'com.google.android.material:material:1.3.0'
+    implementation 'com.github.javiersantos:AppUpdater:2.7'
 }

app/src/main/java/de/joel/zoomhelper/MainActivity.java

@@ -19,6 +19,9 @@ import android.widget.Toast;
 import androidx.appcompat.app.AlertDialog;
 import androidx.appcompat.app.AppCompatActivity;
 
+import com.github.javiersantos.appupdater.AppUpdater;
+import com.github.javiersantos.appupdater.enums.UpdateFrom;
+
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.EOFException;
@@ -80,6 +83,12 @@ public class MainActivity extends AppCompatActivity {
         watchDeleteIcon();
         watchNewIcon();
         watchShareIcon();
+
+
+        AppUpdater appUpdater = new AppUpdater(this).setUpdateFrom(UpdateFrom.XML).setUpdateXML("https://baldaufwd.de/ZoomHelper/update.xml");
+
+        appUpdater.start();
+
     }
 
     private void watchShareIcon() {