Add a quick markdown challenge for new members

A (very) small problem that I noticed is that new members are not that familiar with Gitter’s markdown syntax. Thus, their unformatted code flood the chat channels (some even just straight up paste their challenge URL). I think a quick markdown challenge that tackles the basics allows everyone to have a smoother experience when someone asks for help.This could extend to a slightly more in-depth discussion about Read-Search-Ask and Chat Etiquette.

I think a reasonable challenge is to ask the new member to type their Hello World like this in Gitter chat:

Hello World!

My name is member#01000101. I'm from SomeCity, Country. I found freeCodeCamp through this 
and  that, and I'd be happy to learn how to code with you all! 

NOTE: This is my first Github issue, and I’m not that familiar with how things work around here. Please do tell if I missed something!

[raisedadead]

I found and amazing interactive tutorial http://commonmark.org/help/ by Jeff Atwood and others. This is the team behind the markdown spec at the parent website http://commonmark.org.

I think we should just link it to this.

[DarrenfJ]

My vote would be somewhere close to where the gitter chat is introduced… as @alchermd suggested…

I’ve regularly been in the helpRoom since probably Julyish with a few other ‘regulars’ and we’re often coaching people on the backticks and other markdown