docs(legal): add third-party notices

Author: haithium

THIRD_PARTY_NOTICES

@@ -0,0 +1,90 @@
+THIRD-PARTY NOTICES
+===================
+
+CPython-derived material
+------------------------
+
+Upstream source:
+https://github.com/python/cpython
+
+License:
+Python Software Foundation License Version 2 (PSF-2.0)
+https://docs.python.org/3/license.html
+Copyright (c) 2001 Python Software Foundation; All Rights Reserved.
+
+Derived modules and tests
+-------------------------
+
+ntpath
+~~~~~~
+
+Derived from:
+- Lib/ntpath.py
+- Lib/test/test_ntpath.py
+
+Modifications:
+- Porting Python logic to Lua
+- Adapting behavior to this library's API and conventions
+- Converting tests to Busted table-driven format
+
+posixpath
+~~~~~~~~~
+
+Derived from:
+- Lib/posixpath.py
+- Lib/test/test_posixpath.py
+
+Modifications:
+- Porting Python logic to Lua
+- Adapting behavior to this library's API and conventions
+- Converting tests to Busted table-driven format
+
+PSF-2.0 License Text
+--------------------
+
+PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2
+--------------------------------------------
+
+1. This LICENSE AGREEMENT is between the Python Software Foundation
+("PSF"), and the Individual or Organization ("Licensee") accessing and
+otherwise using this software ("Python") in source or binary form and
+its associated documentation.
+
+2. Subject to the terms and conditions of this License Agreement, PSF hereby
+grants Licensee a nonexclusive, royalty-free, world-wide license to reproduce,
+analyze, test, perform and/or display publicly, prepare derivative works,
+distribute, and otherwise use Python alone or in any derivative version,
+provided, however, that PSF's License Agreement and PSF's notice of copyright,
+i.e., "Copyright (c) 2001 Python Software Foundation; All Rights Reserved"
+are retained in Python alone or in any derivative version prepared by Licensee.
+
+3. In the event Licensee prepares a derivative work that is based on
+or incorporates Python or any part thereof, and wants to make
+the derivative work available to others as provided herein, then
+Licensee hereby agrees to include in any such work a brief summary of
+the changes made to Python.
+
+4. PSF is making Python available to Licensee on an "AS IS"
+basis.  PSF MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR
+IMPLIED.  BY WAY OF EXAMPLE, BUT NOT LIMITATION, PSF MAKES NO AND
+DISCLAIMS ANY REPRESENTATION OR WARRANTY OF MERCHANTABILITY OR FITNESS
+FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF PYTHON WILL NOT
+INFRINGE ANY THIRD PARTY RIGHTS.
+
+5. PSF SHALL NOT BE LIABLE TO LICENSEE OR ANY OTHER USERS OF PYTHON
+FOR ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSS AS
+A RESULT OF MODIFYING, DISTRIBUTING, OR OTHERWISE USING PYTHON,
+OR ANY DERIVATIVE THEREOF, EVEN IF ADVISED OF THE POSSIBILITY THEREOF.
+
+6. This License Agreement will automatically terminate upon a material
+breach of its terms and conditions.
+
+7. Nothing in this License Agreement shall be deemed to create any
+relationship of agency, partnership, or joint venture between PSF and
+Licensee.  This License Agreement does not grant permission to use PSF
+trademarks or trade name in a trademark sense to endorse or promote
+products or services of Licensee, or any third party.
+
+8. By copying, installing or otherwise using Python, Licensee
+agrees to be bound by the terms and conditions of this License
+Agreement.