Added About the App fragment, used libraries info, their licences and authors mentions

app/src/main/res/drawable/ic_about.xml

@@ -1,9 +1,28 @@
+<!--
+  ~ Look4Sat. Amateur radio & weather satellites passes calculator 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.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="32dp"
-    android:height="32dp"
+    android:width="24dp"
+    android:height="24dp"
     android:viewportWidth="24.0"
     android:viewportHeight="24.0">
     <path
-        android:fillColor="#FF000000"
+        android:fillColor="#C0C0C0"
         android:pathData="M12,2C6.48,2 2,6.48 2,12s4.48,10 10,10 10,-4.48 10,-10S17.52,2 12,2zM13,19h-2v-2h2v2zM15.07,11.25l-0.9,0.92C13.45,12.9 13,13.5 13,15h-2v-0.5c0,-1.1 0.45,-2.1 1.17,-2.83l1.24,-1.26c0.37,-0.36 0.59,-0.86 0.59,-1.41 0,-1.1 -0.9,-2 -2,-2s-2,0.9 -2,2L8,9c0,-2.21 1.79,-4 4,-4s4,1.79 4,4c0,0.88 -0.36,1.68 -0.93,2.25z" />
 </vector>