Add file placeholders for characters and chats

public/characters/README.md

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+# Put PNG character cards here.
+
+To create a sprites folder, name it the same as your character (NOT the PNG file).
+
+For example:
+
+- Character: /characters/Asuka Langley.png
+- Sprite: /characters/Asuka Langley/joy.png

public/chats/README.md

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+# Put Chat JSONL files here in subfolders corresponding to character names
+
+For example:
+
+- /chats/Robot/chat.jsonl