docs: add multi-parser mention in the list of packages (#1049)

Author: smoya

README.md

@@ -3,6 +3,7 @@
 This is a Monorepo managed using [Turborepo](https://turbo.build/) and contains the following package:
 
 1. [Parser-js](packages/parser): Use this package to validate and parse AsyncAPI documents —either YAML or JSON— in your Node.js or browser application.
+2. [Multi-Parser](packages/multi-parser): This tool allows the parsing of AsyncAPI documents producing a desired interface based on a given Parser-API version. Useful if your tool needs to support several AsyncAPI Spec versions.
 
 Validation is powered by [Spectral](https://github.com/stoplightio/spectral).  
 Updated bundle for the browser is always attached to the GitHub Release.