build: add Dockerfile

README.md

@@ -2,4 +2,22 @@
 [![build](https://github.com/alterware/iw4-validator/workflows/Build/badge.svg)](https://github.com/alterware/iw4-validator/actions)
 
 # AlterWare: iw4-validator
- You may use this tool to validate client effects GSC files for the IW4 engine
+You may use this tool to validate "client effects" GSC files for the IW4 engine and files containing data from `sv_mapRotation` dvar.
+
+## Build
+- Install [Premake5][premake5-link] and add it to your system PATH
+- Clone this repository using [Git][git-link]
+- Update the submodules using ``git submodule update --init --recursive``
+- Run Premake with either of these two options ``premake5 vs2022`` (Windows) or ``premake5 gmake2`` (Linux/macOS)
+
+#### Command line arguments
+
+- ```-createfx```
+  - Parses a "create fx" file
+    - Do not include a trailing backslash in the path
+- ```-map-rotation```
+  - Parses a "map rotation" file
+    - Do not include a trailing backslash in the path
+
+[premake5-link]:          https://premake.github.io
+[git-link]:               https://git-scm.com