ShowModelResponse is missing several optional properties

[JerrettDavis]

On the Ollama API Documentation they show an example payload that includes a details section that isn't present on the C# response model. Additionally, they make note of an optional system property that may contain a modelfile system prompt.

{
  "modelfile": "# Modelfile generated by \"ollama show\"\n# To build a new Modelfile based on this one, replace the FROM line with:\n# FROM llava:latest\n\nFROM /Users/matt/.ollama/models/blobs/sha256:200765e1283640ffbd013184bf496e261032fa75b99498a9613be4e94d63ad52\nTEMPLATE \"\"\"{{ .System }}\nUSER: {{ .Prompt }}\nASSISTANT: \"\"\"\nPARAMETER num_ctx 4096\nPARAMETER stop \"\u003c/s\u003e\"\nPARAMETER stop \"USER:\"\nPARAMETER stop \"ASSISTANT:\"",
  "parameters": "num_ctx                        4096\nstop                           \u003c/s\u003e\nstop                           USER:\nstop                           ASSISTANT:",
  "template": "{{ .System }}\nUSER: {{ .Prompt }}\nASSISTANT: ",
  "details": {
    "format": "gguf",
    "family": "llama",
    "families": ["llama", "clip"],
    "parameter_size": "7B",
    "quantization_level": "Q4_0"
  }
}

These properties are missing from the current ShowModelResponse.

[awaescher]

Closed with #35. Once again, thanks for helping out.