[Documentation] Adding a design doc for deb/rpm generation with assemble workflow

[peterzhuamazon]

Is your feature request related to a problem?
[Documentation] Adding a design doc for deb/rpm generation with assemble workflow

What solution would you like?
@peterzhuamazon and @zylzulu will create the design doc, two parts, fpm pkg generation and assemble workflow wrapping.

What alternatives have you considered?
A clear and concise description of any alternative solutions or features you've considered.

Do you have any additional context?
Add any other context or screenshots about the feature request here.

[peterzhuamazon]

We have created an initial design docs with reviews.
We will publish this design in a form of readme later.

Thanks.

[zelinh]

Closing this and we will update the design doc as part of README.

[peterzhuamazon]

We created an issue with the design and link in the readme: #1452