add README

README.md

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+# CoaXPress-SFP
+SFP plugin with CoaXPress camera input
+
+The uplink side relies on MGT Tx transceiver and needs custom firmware
+
+The project is designed using KiCad 9
+
+## Reproducible Project Outputs with Nix
+User can run the following commands to export all the project output including Gerber & Drill files, Bill of Materials file, Schematics PDF and two renders (top-down and bottom-up) PNG.
+- `nix build`
+
+## Development Environment
+User can fetch the correct KiCad Version used in the project by running the following command.
+- `nix develop`