Add activity to the AndroidManifest.xml

app/src/main/AndroidManifest.xml

@@ -11,6 +11,18 @@
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
-        android:theme="@style/AppTheme" />
+        android:theme="@style/AppTheme">
 
+        <activity
+            android:name=".app.AuthenticationActivity"
+            android:theme="@style/AuthenticationTheme">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+    </application>
 </manifest>
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