add inputs and outputs

action.yaml

@@ -1,5 +1,12 @@
 name: 'Simple Go Action'
 description: 'A simple Gitea Action written in Go'
+inputs:
+  username:
+    description: 'The username to print'
+    required: true
+outputs:
+  time:
+    description: 'The time when the action was called'
 runs:
   using: 'go'
   main: 'main.go'