docs(hotreload): add docs

.docs/hotreload.md

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+# HotReload
+
+HotReload automatically reloads cogs in local cog paths on file change.  
+This is useful for development, as it allows you to make changes to your cogs and see the changes reflected in Discord immediately, without having to manually `[p]reload` the cog.
+
+## Installation
+
+```bash
+[p]repo add seacogs https://www.coastalcommits.com/cswimr/SeaCogs
+[p]cog install seacogs hotreload
+[p]cog load hotreload
+```
+
+## Commands
+
+### hotreload notifychannel
+
+Set the channel where hotreload will send notifications when a cog is reloaded.
+
+### hotreload list
+
+Debugging command that shows the list of currently active observers. May be expanded in the future to show watched file paths.