chore(ox_lib): add docs for getFilesInDirectory (#255)

Author: unitysync

pages/ox_lib/Modules/GetFilesInDirectory/Server.mdx

@@ -0,0 +1,17 @@
+# Server
+
+## lib.getFilesInDirectory
+Gets a list of all files in a specified resource directory, along with the file count
+
+```lua
+lib.getFilesInDirectory(path, pattern)
+```
+
+- path: `string`
+    - The relative or absolute path to the directory where files should be listed.
+- pattern: `string`
+    - Pattern to check for when searching for files.
+
+Returns:
+- files: `string[]`
+- fileCount: `number`