Allow user to specify annotation during the task add command

#### To report a bug...

* What command(s) did you run? --
* What did you expect to happen?
* What actually happened?
* Paste the output of the ```task diag``` command.

#### To request a feature...

* Clearly describe the feature.
Allow for task add command to support say the value annotation:"where now I can specify the annotation directly in the task creation process"

* Clearly state the use case. We are only interested in use cases, do not waste time with implementation details or suggested syntax.
Use case -- you want to keep titles short and descriptive... but because you're lazy like me... or you're thinking through the task and what it entails when you're writing it... and either way you don't want to wait till you have an ID then add a description you do something like this (real example):

task add 'look thru email for webinar deal on appsumo and contact company to see if i can redeem it -- tell them about being able to reach more potential customers as a reason for doing it'

really that should be:
task add 'investigate cheap webinar solutions'
task 1 annotate 'look thru email for webinar deal on appsumo and contact company to see if i can redeem it -- tell them about being able to reach more potential customers as a reason for doing it'

Note: i know that you can import tasks using yml, or json, but I hate having to do it that way, because I've created all kinds of nice easy abbreviations like ta becomes task add to make adding a task as easy as possible directly from the command line.

Thanks again for awesome software!
* Please see our notes on [How to request a feature](https://taskwarrior.org/docs/features.html)