modelCard Input/output descriptions

**Goals**
As someone who may be reviewing MLBOMs in the future, I don't only want to know the format of each input and output, but what actual inputs/outputs are provided. E.g., rather than saying "text" or "binary", the BOM would tell me that model1 inputs text descriptions and outputs images, or model2 takes in images and outputs PDF files, etc.

**Details**
FieldNames: Components.modelCard.modelParameters.inputs.description, Components.modelCard.modelParameters.outputs.description

Required: No

**Snippet**

```json
"modelCard": [
"modelParameters": [
"inputs" : { "description" : "English text" },
"output" : { "description" : "mp3 audio files" }
]
]
```