Create proposal for alizer devfile detection logic and default ports

## Which area/kind this issue is related to?

/area alizer
/area documentation

## Issue Description
This issue is part of https://github.com/devfile/api/issues/1154 and is focusing on the creation of the proposal.

## Acceptance Criteria
- [x] As a result, a proposal for the feature of Devifle port detection and default ports per framework should be created under **docs/proposals**
