ADD: added initial README

README.md

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+# libtree++
+
+## Description
+
+libtree++ is a small tree library written in C++. It is optimized for use with bison and flex
+to generate Abstract Syntax Trees (ASTs).
+
+## AUTHOR
+
+Dominik Meyer <dmeyer@federationhq.de>
+
+## LICENSE
+
+Copyright (C) 2019  Dominik Meyer
+
+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 3 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, see <https://www.gnu.org/licenses/>.