Add a readme

Signed-off-by: Joseph Mattiello <[email protected]>

Author: JoeMatt

README.md

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+# Provenance Data
+
+_repo to hold test roms, screenshot and index generation scripts_
+
+## How to help
+
+### Add ROMs
+
+- Find a legal!, open-source homebrew or open domain rom
+- Rename ambigous extensions, fix spacing and formatting, ie; for Genesis, `my_demo_rom.bin` to `My Demo Rom.gen`
+- Zip it in a flat file with no other unrelated files, with the same filename as the game; ie; `My Demo ROM.zip`
+- Optionally, but preffered, add artwork. See "Add Artwork"
+
+### Add artwork
+
+- clone this repo
+- add artwork in the format (ROMNAME)-screenshot.png/jpg/jpeg or (ROMNAME)-cover.png/jpg/jpeg
+- run the generation script
+  ```sh
+  python scan_roms.py
+  ```
+-- commit, push, make a pull-request