Add a section in HF runtime README explaining the use of params.uri a…

…nd params.extra.pretrained_model

runtimes/huggingface/README.md

@@ -55,6 +55,36 @@ MLSERVER_MODEL_HUGGINGFACE_OPTIMUM_MODEL=true
 ```
 ````
 
+### Loading local models
+It is possible to load a model from a local path into a HuggingFace pipeline, if desired. 
+The path must point to a folder containing the model artefacts compatible with the HuggingFace specifications.
+#### Multi-model serving folder structure
+In the case of MMS, the example below assumes the desired model folder resides in `./models`, e.g. `./models/your-model-artefacts-folder` and inside a `models-settings.json` file is expected to exist.
+The `uri` field could be an absolute path to the model artefacts folder or a relative path to the folder from which MLServer is started.
+```{code-block} json
+---
+emphasize-lines: 5-5
+---
+{
+  "name": "qa",
+  "implementation": "mlserver_huggingface.HuggingFaceRuntime",
+  "parameters": {
+      "uri": "./models/your-model-artefacts-folder",
+      "version": "v1.0",
+      "extra": {
+          "task": "question-answering",
+      }
+  }
+}
+```
+
+````{note}
+If a `parameters.extra.pretrained_model` parameter is specified in `parameters.extra` section, it will take precedence 
+over `parameters.uri`. Furthermore, in the case of MMS, `parameters.extra.pretrained_model` and `parameters.uri` can 
+be used interchangeably only if the paths provided are absolute. This is because the `parameters.extra.pretrained_model` 
+expects a relative path to itself, i.e. relative to the `model-settings.json`.
+````
+
 ### Reference
 
 You can find the full reference of the accepted extra settings for the