Doc/improved example

[SGSSGene]

• Adds minimal readme
• Extends the cwl_output_example.cpp to include a few more cases
• Add tests against an example output

The benefits of the additional example output are:

1. Knowledge about the to expected output
2. Better understanding of changes:
   If this would have been available earlier we could have seen that

inputs:
  - id: firstOption
    type: long
    inputBinding:
      prefix: --first-option
  - id: inputFile
    type: File
    inputBinding:
      prefix: --input-file

changed to

inputs:
  firstOption:
    type: long
    inputBinding:
      prefix: --first-option
  inputFile:
    type: File
    inputBinding:
      prefix: --input-file

We would also have seen that following fields moved to the beginning of the document:

id: Some id
label: some label
doc: documentation that is brief