Add license

LICENSE

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+Copyright (c) 2025 Jarrod Doyle
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+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 OR COPYRIGHT HOLDERS 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.

README.md

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+# KeepersCompound: Lightmapper
+
+## Description
+
+[TTLG Release Thread](https://github.com/JarrodDoyle/KeepersCompound.Lightmapper)
+
+KCLight is an external lightmapping tool for [NewDark 1.27](https://www.ttlg.com/forums/showthread.php?t=149856) fan mission. DromEd's built-in lighting is single-threaded, has a number of bugs, and scales extremely poorly with lightmap scale and large open spaces. KCLight uses a multi-threaded approach with a modern raytracing library to improve lighting times, reduce lighting artifacts, and often improves in-game performance in complex scenes.
+
+## Features
+- All DromEd lighting functionality
+- Massively improved lighting times
+- Better light culling, improving performance in large-scale city maps and eliminating object lighting errors
+- Additional warnings to mappers for mis-configured lights
+- Produces generally more accurate shadows
+
+## Usage
+Download the [latest release](https://github.com/JarrodDoyle/KeepersCompound.Lightmapper/releases/latest) and unzip it somewhere. Open a console in the unzipped folder and run `KeepersCompound.Lightmapper --help` to see the help screen:
+
+```
+Compute lightmaps for a NewDark .MIS/.COW
+
+Usage:
+  KeepersCompound.Lightmapper <install-path> <campaign-name> <mission-name> 
+  [options]
+
+Arguments:
+  <install-path>   The path to the root Thief installation. [required]
+  <campaign-name>  The folder name of the fan mission. For OMs this is blank. 
+                   [required]
+  <mission-name>   The name of the mission file including extension. [required]
+
+Options:
+  -f, --fast-pvs     Use a fast PVS calculation with looser cell light indices. 
+                     [default: False]
+  -o, --output-name  Name of output file excluding extension. [default: kc_lit]
+  -?, -h, --help     Show help and usage information
+  -v, --version      Show version information
+```
+
+## Building
+
+This project requires the [.NET 9.0 runtime and SDK](https://dotnet.microsoft.com/en-us/download/dotnet/9.0). Raytracing uses a forked version of [TinyEmbree](https://github.com/pgrit/TinyEmbree) with backface culling enabled, a pre-built package can be found in `LocalPackages`.
+
+## License
+
+Distributed under the MIT License. See `LICENSE` for more information.