Add About Dialog and PCL LICENSE

about/tenmon

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+<table><tr>
+<td style="padding-right:10px"><img src=":/org.nou.tenmon.png"></td>
+<td><h3>Tenmon</h3>
+Tenmon is FITS/XISF image viewer and converter. It also index FITS keywords.<br>
+Copyright © 2022 Dušan Poizl<br><br>
+
+This program is free software: you can redistribute it and/or modify<br>
+it under the terms of the GNU General Public License as published by<br>
+the Free Software Foundation, either version 3 of the License, or<br>
+(at your option) any later version.<br><br>
+
+This program is distributed in the hope that it will be useful,<br>
+but WITHOUT ANY WARRANTY; without even the implied warranty of<br>
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the<br>
+GNU General Public License for more details.<br><br>
+
+You should have received a copy of the GNU General Public License<br>
+along with this program.  If not, see <a href="http://www.gnu.org/licenses/">http://www.gnu.org/licenses/</a>.
+</td>
+</tr></table>