Add LICENSE and README

Author: dresnite

LICENSE.txt

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+Copyright (C) 2016  GiantQuartz
+
+    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 <http://www.gnu.org/licenses/>.

README.md

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+# SkyBlock
+SkyBlock for PocketMine-MP servers.
+### Contributions
+You are free to contribute to this project, any kind of help is accepted.
+### Where I can download it?
+You can download it [here](https://github.com/GiantQuartz/SkyBlock/releases).