add BSD-2-clause license

LICENSE

@@ -0,0 +1,25 @@
+BSD 2-Clause License
+
+Copyright (c) [2022], [Beeno Tung (Tung Cheung Leong)]
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.md

@@ -414,3 +414,14 @@ function optional<T>(parser: Parser<T>): Parser<T | undefined>
 ## Acknowledgments
 
 The icon of cast.ts is generated with [diffuse-the-rest](https://huggingface.co/spaces/huggingface/diffuse-the-rest) and post-processed with [GIMP](https://www.gimp.org).
+
+## License
+
+This project is licensed with [BSD-2-Clause](./LICENSE)
+
+This is free, libre, and open-source software. It comes down to four essential freedoms [[ref]](https://seirdy.one/2021/01/27/whatsapp-and-the-domestication-of-users.html#fnref:2):
+
+- The freedom to run the program as you wish, for any purpose
+- The freedom to study how the program works, and change it so it does your computing as you wish
+- The freedom to redistribute copies so you can help others
+- The freedom to distribute copies of your modified versions to others

package.json

@@ -14,7 +14,7 @@
   },
   "keywords": [],
   "author": "",
-  "license": "ISC",
+  "license": "BSD-2-Clause",
   "devDependencies": {
     "@types/chai": "^4.3.3",
     "@types/mocha": "9",