add info to readme

README.md

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 ## Cassidy talking head for Fallout 2
+
+This package contains Cassidy talking head and English voiced lines.
+
+### Installation
+- For [UPU](https://github.com/BGforgeNet/Fallout2_Unofficial_Patch), download `cassidy_head.dat` and one of the voice `.dat`s from the [latest release page](https://github.com/BGforgeNet/Fallout2_Cassidy_Head/releases/latest), drop them into `mods` directory.
+- Already included into [RPU](https://github.com/BGforgeNet/Fallout2_Restoration_Project).
+
+### Voice options
+- Adam Dravean's version is the one that was included with RP 2.3.3.
+- Joey Bracken's version comes in HQ (44kHz) and LQ (22kHz).
+
+If you prefer Cassidy to be silent, you can use the head without a voice dat.
+
+### Credits
+- [Head](https://www.nma-fallout.com/threads/cassidys-talking-head-needs-a-voice.182559/) was originally made for the Mutants Rising mod by mad, and further edited by Continuum.
+- Adam Dravean: voice acting.
+- Joey Bracken: [voice acting](https://www.nma-fallout.com/threads/new-voice-for-cassidy.218116/).