Add LICENSE

LICENSE

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+                    Copyright (c) 2022 Philip Rebohle
+
+                          zlib/libpng license
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+– The origin of this software must not be misrepresented; you must not
+  claim that you wrote the original software. If you use this software
+  in a product, an acknowledgment in the product documentation would be
+  appreciated but is not required.
+
+– Altered source versions must be plainly marked as such, and must not
+  be misrepresented as being the original software.
+
+– This notice may not be removed or altered from any source distribution.