Restore READMEs for logs/ subdirs

logs/chat/README.md

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+Logs of chat rooms are stored in this directory if `logchat` is enabled.

logs/logging.md

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+Pokémon Showdown Logging
+========================================================================
+
+This is the Pokémon Showdown log directory.
+
+Pokémon Showdown will, by default, log rated battles in each format, but not unrated
+battles. To enable logging of unrated battles, turn on the config setting `logchallenges`.
+There is currently no config option to disable logs for rated battles.
+Battle logs are placed under a subdirectory for each month (e.g. `2013-02`).
+
+Moderator actions are logged in the subdirectory `modlog`.
+Each chat room has a separate log file (e.g. `modlog_lobby.txt`).
+Battle rooms share a single log file, which is named `modlog_battle.txt`.
+
+If the server or the simulator process crashes, a stack trace will
+usually be logged to `errors.txt`.
+
+By default, Pokémon Showdown does not log chat rooms. However, you can
+enable their logging by setting the `logchat` option in `config.js`.
+If you enable it, the logs are written in the subdirectory named `chat`.
+Each room gets their own subdirectory within, which are furthermore classified by month.
+

logs/modlog/README.md

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+Logs of moderation actions are stored in this directory.

logs/repl/README.md

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+# repl directory
+
+The REPL feature is enabled by default; it can be disabled in `config.js`.
+
+This directory is used by default to store the REPL sockets to all of showdown's processes.
+
+The intended uses of these REPL sockets are for debugging (especially when the server is seemingly frozen) and scripting.
+
+You can use any tool capable of talking to Unix sockets such as `nc`. e.g. `nc -U app`, replacing `app` with the name of any socket in this directory.

logs/tickets/README.md

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+Logs of ticket stats are stored in this directory.