Add screenshot to README.md

Add screenshot to README.md

and fix small typo

diff --git a/README.md b/README.md
index bd9f94d..bb92e12 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,11 @@
 
 This plugin was designed for heavily moderated sites, once installed we track which moderator read which post and when.
 
-Any unmoderated topics (topics with at least 1 unmoderated post) will be displayed in the topic list with and asterisk for moderators only.
+Any unmoderated topics (topics with at least 1 unmoderated post) will be displayed in the topic list with an asterisk for moderators only.
+
+### Screenshot
+
+![mod](https://user-images.githubusercontent.com/5862206/116389180-4b4f7480-a83a-11eb-98ee-54347d01ab2d.png)
 
 ## License
 

GitHub sha: f6a4e7a83271e908e6b75cc93206b39e835786dd