Introduce CLI Aliases to IF

[narekhovhannisyan]

What

Introduce CLI shortcuts for IF flags to make UI simplier. Such as:

Why

To run the IF framework rapidly, use short keywords for --manifest, --output, --help and --stdout.

SoW (scope of work)

• Documentation updated
• QA Tested

Acceptance criteria

• Updated IF with working shortcuts
• GIVEN this update has been implemented and a user has downloaded and installed if
  WHEN a user runs the following command ie -m <path-to-a-manifest>
  THEN ie should execute identically to the command `ie --manifest
  The same should apply to the following mapping of shortkeys to commands:

shortkey	command
-h	--help
-m	--manifest
-o	--output
-s	--stdout

• Updated Documentation

The shortkeys should be described in the IF readme and on the CLI page on if.greensoftware.foundation

ie -h // help
ie -m <manifest-path> -o <output-path> -s // manifest, output paths, stdout

[MariamKhalatova]

@narekhovhannisyan Tested from my side, you can update the docs accordingly.

[jmcook1186]

reopening as docs not yet updated

[MariamKhalatova]

@jmcook1186 @narekhovhannisyan Updated documentations accordingly
#708
Green-Software-Foundation/if-docs#73