Create README.md

Author: jedypod

README.md

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+# OCIOGen
+is a minimal from-scratch OpenColorIO config generator. It has only one dependency: `opencolorio`. 
+
+All gamut conversion matrices are calculated from scratch using [colorimetry math](/utilities/colorimetry.py).
+
+## Install Dependencies
+Make sure you have python version 3.7 or greater, then: `python3 -m pip install opencolorio`
+
+## Usage Instructions
+Open `ociogen.py` with python. This will launch a very ugly but functional user interface as shown below:
+![screenshot_2025-03-16_22-10-21](https://github.com/user-attachments/assets/9150dae2-afb2-428d-9382-48a7dc88fb01)
+
+You can 
+- enter the name of your config and the parent directory you want to save it into
+- choose whether you want to create an OCIO v1.0 or an OCIO v2.0 config. 1.0 will use `.spi1d` LUTs for the transfer functions, while 2.0 will try to use built in camera log functions where possible.
+- select the colorspaces you want added to your config
+- choose the reference space (all gamut conversion matrices will be in reference to this colorspace, and all linear roles will be set to this)
+- choose the reference log space (all log roles will be set to this, for example `color_timing`)
+- click "Generate Config", and edit the result to add your own views.