Add files (#3826)

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diff --git a/docs/guides/read-file/mime.md b/docs/guides/read-file/mime.md
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+---
+name: Get the MIME type of a file
+---
+
+The `Bun.file()` function accepts a path and returns a `BunFile` instance. The `BunFile` class extends `Blob`, so use the `.type` property to read the MIME type.
+
+```ts
+const file = Bun.file("./package.json");
+file.type; // application/json
+
+const file = Bun.file("./index.html");
+file.type; // text/html
+
+const file = Bun.file("./image.png");
+file.type; // image/png
+```
+
+---
+
+Refer to [API > File I/O](/docs/api/file-io) for more information on working with `BunFile`.