docs: dedicate Claro to the public domain under The Unlicense

LICENSE

@@ -1 +1,24 @@
-MIT License
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <https://unlicense.org/>

README.md

@@ -80,4 +80,9 @@ compilation, use [build98.bat and its guide](docs/WINDOWS98.md).
 
 ## License
 
-See [LICENSE](LICENSE).
+Claro is free and unencumbered software released into the **public domain**
+under [The Unlicense](LICENSE) (SPDX: `Unlicense`). You may use, modify, and
+redistribute it for any purpose, including commercially, without attribution
+or royalties. The software is provided without warranty.
+
+Third-party dependencies retain their respective licenses.