Added NavActivity as a future replacement for the MainActivity

app/src/main/res/menu/nav_menu.xml

@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Look4Sat. Amateur radio and weather satellite tracker and passes predictor for Android.
+  ~ Copyright (C) 2019, 2020 Arty Bishop (bishop.arty@gmail.com)
+  ~
+  ~ This program is free software; you can redistribute it and/or modify
+  ~ it under the terms of the GNU General Public License as published by
+  ~ the Free Software Foundation; either version 2 of the License, or
+  ~ (at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,
+  ~ but WITHOUT ANY WARRANTY; without even the implied warranty of
+  ~ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  ~ GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along
+  ~ with this program; if not, write to the Free Software Foundation, Inc.,
+  ~ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+  -->
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+    <item
+        android:id="@+id/nav_satellites"
+        android:icon="@drawable/ic_sat_desc_left"
+        android:title="@string/menu_bottom_entries" />
+    <item
+        android:id="@+id/nav_passes"
+        android:icon="@drawable/ic_list"
+        android:title="@string/menu_bottom_passes" />
+    <item
+        android:id="@+id/nav_world_map"
+        android:icon="@drawable/ic_update_tle"
+        android:title="@string/menu_bottom_osm" />
+    <item
+        android:id="@+id/nav_settings"
+        android:icon="@drawable/ic_settings"
+        android:title="@string/menu_settings" />
+    <item
+        android:id="@+id/nav_about"
+        android:icon="@drawable/ic_help_outline"
+        android:title="@string/menu_bottom_about" />
+</menu>