adding proposal for dockerfile components

[mike-hoang]

What does this PR do?

Initial draft for improving port detection logic for cases where the dockerfiles are not found in a component.

Which issue(s) does this PR fix

fixes https://github.com/redhat-developer/alizer/issues/244

PR acceptance criteria

Testing and documentation do not need to be complete in order for this PR to be approved. We just need to ensure tracking issues are opened.

• [x] Unit/Functional tests

• [x] Documentation

How to test changes / Special notes to the reviewer

[mike-hoang]

PR moved to https://github.com/devfile/alizer/pull/3