chore: update readme

README.md

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 Using this action to perform uploads in CI is useful because it allows for multiple people on a team to be able to trigger releases, and it allows for automated releases without having to manually use the GUI.
 
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 ## Example Usage
 
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 Note that the action will only work if you have added the ["config.vdf" file as a repository secret](#authentication--steam-guard); see below.
 
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 ## First Upload
 
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 After uploading a mod for the first time, the `id` field will appear inside of the "metadata.xml" file. (This ID corresponds to the URL for the mod on the Steam Workshop.)
 
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 ## `mod` Subdirectory
 
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 The action will look in the "metadata.xml" file to find your mod's ID.
 
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 ## Authentication & Steam Guard
 
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 Now, you can attempt to trigger the GitHub action to see if it works.
 
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+## IsaacScript
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+If you find this GitHub action useful, you should consider using it in a TypeScript mod. TypeScript has the advantage of auto-complete, auto-importing, and the compiler preventing you from ever making a typo. Taken together, it makes for a dream-like Isaac development experience.
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+For more information, see the [list of features](https://isaacscript.github.io/main/features). (If you don't know how to program in TypeScript, then you can learn in around [30 minutes](https://isaacscript.github.io/main/javascript-tutorial).)
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