Demo doc added.

Author: Kuznietsov

docs/developer/plugin-list.asciidoc

@@ -72,6 +72,10 @@ This API doesn't support angular, for registering angular dev tools, bootstrap a
 |This plugin contains reusable code in the form of self-contained modules (or libraries). Each of these modules exports a set of functionality relevant to the domain of the module.
 
 
+|{kib-repo}blob/{branch}/src/plugins/expression_reveal_image/README.md[expressionRevealImage]
+| This plugin addes expression to the canvas to be rendered
+
+
 |<<kibana-expressions-plugin>>
 |Expression pipeline is a chain of functions that *pipe* its output to the
 input of the next function. Functions can be configured using arguments provided