add README.md describing licensing

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+MoLe is a front-end to [[http://hledger-web.org hledger-web]]
+
+# Copyright and licensing
+
+## Main software
+
+Copyright ⓒ 2018, 2019 Damyan Ivanov <dam+mole@ktnx.net>
+
+MoLe is free software: you can distribute it and/or modify it
+under the term of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your opinion), any later version.
+
+MoLe 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 terms for details.
+
+You should have received a copy of the GNU General Public License
+along with Mobile-Ledger. If not, see <https://www.gnu.org/licenses/>.
+
+## Other items
+
+Some icons taken from the Android open-source project are 
+Copyright Google Inc and/or Android open-source project and licensed under the
+Apache License, version 2.0 (https://www.apache.org/licenses/LICENSE-2.0)