Add licensing information

Author: F30

LICENSE.txt

@@ -0,0 +1,13 @@
+Copyright (c) 2021 Felix Dreissig
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE.

README.md

@@ -119,6 +119,8 @@ You might have to adjust some (hardcoded) paths to the ones of your local instal
 
 Copyright
 ---------
+Except otherwise noted, the code is licensed under the ISC license.
+
 The "llvm-patches" directory contains patch files to [LLVM project](https://github.com/llvm/llvm-project) code. LLVM consists of contributions from various authors, licensed under the Apache (Version 2.0) license with LLVM Exceptions and/or the Legacy LLVM license.
 
 The "rust-patches" directory contains patch files to [Rust](https://github.com/rust-lang/rust) code. Rust consists of contributions from various authors, dual-licensed under the Apache (Version 2.0) and MIT licenses.