Update README.md

Author: tkjaer

README.md

@@ -3,10 +3,12 @@ Let's add back some things.
 Maybe a mermaid diagram as well:
 
 ```mermaid
+flowchart LR
+1 --> 2
 ```
 
 And some text below it.
 
 ## hello header 2
 
-And a link <https://github.com/tkjaer/gallery/pull/15>
+And a link [link](https://github.com/tkjaer/gallery/pull/15).