How can I add multiple lines into description

[sitereliabilityengineer]

Hello, this is my first message here.

I'm trying to add multiple lines to the description but it's not working. I've tried with

, with < ! [ CDATA[Hi Rss feed
Here is new line ]]>

But it's not showing multiple lines. Is this an issue from my reader or I might be doing it wrong ?

Thank you so much.