add license.md

Author: PascalCorpsman

license.md

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+There are two licenses for this software you can choose of:
+# 1. Postcardware                                              
+  you can download COPYING.Postcardware using this link: <br>
+  https://github.com/PascalCorpsman/Software_Licenses/blob/main/COPYING.Postcardware.txt 
+
+or
+# 2. modified LGPL (as described in COPYING.modifiedLGPL)
+  you can download COPYING.modifiedLGPL using this link: <br>
+  https://github.com/PascalCorpsman/Software_Licenses/blob/main/COPYING.modifiedLGPL.txt 
+
+