docs: Add missing docs for import directive

src/docs/markdown/caddyfile/directives/import.md

@@ -0,0 +1,26 @@
+---
+title: import (Caddyfile directive)
+---
+
+# import
+
+Includes a [snippet](/docs/caddyfile/concepts#snippets) or file, replacing this directive with the contents of the snippet or file.
+
+This directive is a special case: it is evaluated before the structure is parsed, and it can appear anywhere in the Caddyfile.
+
+## Syntax
+
+```
+import <pattern>
+```
+
+- **&lt;pattern&gt;** is the filename, glob pattern, or name of [snippet](/docs/caddyfile/concepts#snippets) to include. Its contents will replace this line as if that file's contents appeared here to begin with. It is an error if a specific file cannot be found, but an empty glob pattern is not an error.
+
+
+## Examples
+
+Import all files in an adjacent sites-enabled folder:
+
+```
+import sites-enabled/*
+```