Add cwolf license

src/cdogs/cwolfmap/LICENSE

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+BSD 2-Clause License
+
+Copyright (c) 2020, Cong
+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.

src/cdogs/cwolfmap/README.md

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+# cwolfmap
+
+[![Build Status](https://github.com/cxong/cwolfmap/workflows/Build/badge.svg)](https://github.com/cxong/cwolfmap/actions)
+
+Wolf 3D map reader in C
+
+This project implements a C library that reads Wolf 3D maps (GameMaps format): http://www.shikadi.net/moddingwiki/GameMaps_Format
+
+## Features
+
+- Read map data, levels, planes
+- Extract and play adlib music (WLF/IMF files)
+- Play adlib sound effects
+- Extract and play digital sound (RAW/WAV)
+
+### Supported Games
+
+- Blake Stone: Aliens of Gold (shareware, registered)
+- Spear of Destiny
+- Spear of Destiny mission packs
+- Wolfenstein 3D (shareware, registered)
+
+![screenshot](https://github.com/cxong/cwolfmap/blob/master/screenshot.png)