adds password visibility toggle feature to login screen password field

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

@@ -104,6 +104,7 @@
                 android:id="@+id/text_input_passwd"
                 android:layout_width="0dp"
                 android:layout_height="wrap_content"
+                app:passwordToggleEnabled="true"
                 app:layout_constraintBottom_toTopOf="@+id/btn_user_registration"
                 app:layout_constraintLeft_toLeftOf="parent"
                 app:layout_constraintRight_toRightOf="parent"