chore: add screenshot

README.md

@@ -1,7 +1,9 @@
+
 eslint-plugin-no-lookahead-lookbehind-regexp
 ==============================
+<img src="https://github.com/JonasBa/eslint-plugin-no-lookahead-lookbehind-regexp/blob/d42144e58aa0e428b0ad0d3bd43b070b835e07b0/example.png?raw=true" width="70%"/>
 
-Lint the use of lookahead and lookbehind regexp expression. The expression is problematic, as compiling it in an unsupported browser will throw an error. 
+Lint the use of lookahead and lookbehind regexp expression. The expression is problematic, as compiling it in an unsupported browser will throw an error. The plugin handles both [literal and constructor notation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/RegExp#literal_notation_and_constructor).
 
 ### 1. Install