document submission inspection and deletion flow

Author: msaroufim

README.md

@@ -124,6 +124,23 @@ popcorn submissions delete <ID>
 popcorn submissions delete <ID> --force
 ```
 
+Smallest possible flow:
+
+```bash
+# 1. List your submissions and note the ID
+popcorn submissions list --leaderboard grayscale_v2
+
+# 2. Inspect the stored code for that submission ID
+popcorn submissions show 1234
+
+# 3. Delete that submission ID
+popcorn submissions delete 1234
+```
+
+`list` shows the submission `ID`, `show` prints the full submitted code for that `ID`, and `delete` previews the submission and asks for confirmation before removing it.
+
+If you have a reward-hacked or otherwise bad submission, you can use this flow to find the submission ID, inspect the exact code that was stored, and delete it yourself.
+
 ### Authentication
 
 Register or re-register your CLI with Discord or GitHub.