How-on on adding task box needs refactoring

[hugoqribeiro]

This how-to topic needs improvements:

• The text needs to adhere to the form used in other topics (you instead of we, more details in steps, etc.)
• The steps required need to be simplified (new features in Hydrogen?)
• The topic is not listed in README

[p-brito]

• [x] The text needs to adhere to the form used in other topics :

• [x] you instead of we

• [x] more details steps

• [x] The steps required need to be simplified (new features in Hydrogen?)

• [x] The topic is not listed in README

[hugoqribeiro]

@p-brito close the issue, if resolved.