docs: Add explanation of status characters

assets/chezmoi.io/docs/reference/commands/status.md

@@ -5,7 +5,16 @@ similar to [`git status`](https://git-scm.com/docs/git-status).
 
 The first column of output indicates the difference between the last state
 written by chezmoi and the actual state. The second column indicates the
-difference between the actual state and the target state.
+difference between the actual state and the target state, and what effect
+running [`chezmoi apply`](/apply.md) will have.
+
+| Character | Meaning   | First column       | Second column          |
+| --------- | --------- | ------------------ | ---------------------- |
+| Space     | No change | No change          | No change              |
+| `A`       | Added     | Entry was created  | Entry will be created  |
+| `D`       | Deleted   | Entry was deleted  | Entry will be deleted  |
+| `M`       | Modified  | Entry was modified | Entry will be modified |
+| `R`       | Run       | Not applicable     | Script will be run     |
 
 ## `-i`, `--include` *types*