Added resources readme

celeste/resources/README.md

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+# Celeste-AI resources
+
+ - `./carts/celeste.p8`: Unmodified *Celeste Classic* cart
+ - `./carts/hackcel.p8`: *Celeste Classic* modified with delays and debug
+ - `./pico8`: An old version of PICO-8
+ - `./images`: Miscellaneous images for pretty plots. Not used by scripts yet.
+
+
+## PICO-8 setup
+1. Run `./pico-8/linux/pico8`
+2. Once it starts, type `folder`. This will open the PICO-8 root folder in your file browser.
+3. Copy both carts in `./carts` into that folder.
+
+## PICO-8 basics
+ - `load name.p8`: load a game into memory
+ - `run`: run that game
+ - `folder`: open PICO-8 root in file browser
+ - `shutdown`: exit PICO-8
+ - `<escape key>`: toggle editor or exit a game.
+
+That's all you need to know to train Celeste-AI.