docs: make universe

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

docs/reference/universe/io.md

@@ -0,0 +1,59 @@
+---
+sidebar_label: io
+---
+
+# dagger.io/io
+
+## #Dir
+
+Standard interface for directory operations in cue
+
+### #Dir Inputs
+
+_No input._
+
+### #Dir Outputs
+
+_No output._
+
+## #File
+
+Standard interface for file operations in cue
+
+### #File Inputs
+
+_No input._
+
+### #File Outputs
+
+_No output._
+
+## #ReadWriter
+
+### #ReadWriter Inputs
+
+_No input._
+
+### #ReadWriter Outputs
+
+_No output._
+
+## #Reader
+
+### #Reader Inputs
+
+_No input._
+
+### #Reader Outputs
+
+_No output._
+
+## #Writer
+
+### #Writer Inputs
+
+_No input._
+
+### #Writer Outputs
+
+_No output._