Add models spec documentation (#127)

* Add models spec documentation

* add note

* add note

* update model warnings

spiceaidocs/content/en/machine-learning/_index.md

@@ -5,3 +5,5 @@ linkTitle: 'Machine Learning'
 description: ''
 weight: 60
 ---
+
+{{< alert color="warning" title="Early Preview" >}}The Spice ML runtime is in its early preview phase and is subject to modifications.{{< /alert >}}

spiceaidocs/content/en/machine-learning/model-deployment/huggingface.md

@@ -0,0 +1,6 @@
+---
+type: docs
+title: "Huggingface"
+linkTitle: "Huggingface"
+weight: 100
+---

spiceaidocs/content/en/machine-learning/model-deployment/spiceai.md

@@ -0,0 +1,6 @@
+---
+type: docs
+title: "SpiceAI"
+linkTitle: "SpiceAI"
+weight: 90
+---

spiceaidocs/content/en/reference/Spicepod/_index.md

@@ -94,15 +94,25 @@ datasets:
 
 ## `models`
 
-A Spicepod can contain one or more [models](https://docs.spice.ai/reference/specifications/models-yaml-specification) referenced by relative path.
+A Spicepod can contain one or more [models]({{<ref "reference/spicepod/models">}}) referenced by relative path.
 
 **Example**
 
 A model referenced by path.
 
 ```yaml
 models:
-  - from: models/gas_fees
+  - from: models/drive_stats
+```
+
+A model defined inline.
+
+```yaml
+models:
+  - from: spiceai:spice.ai/lukekim/smart/models/drive_stats:latest
+    name: drive_stats
+    datasets:
+      - drive_stats_inferencing
 ```
 
 ## `dependencies`

spiceaidocs/content/en/reference/Spicepod/models.md

@@ -0,0 +1,94 @@
+---
+type: docs
+title: "Models"
+linkTitle: "Models"
+description: 'Models YAML reference'
+weight: 90
+---
+
+{{< alert color="warning" title="Early Preview" >}}The model specifications are in early preview and are subject to change.{{< /alert >}}
+
+A Spicepod can contain one or more models referenced by relative path, or defined inline.
+
+# `models`
+
+Inline example:
+
+`spicepod.yaml`
+```yaml
+models:
+  - from: spiceai:spice.ai/lukekim/smart/models/drive_stats:latest
+    name: drive_stats
+    datasets:
+      - drive_stats_inferencing
+```
+
+`spicepod.yaml`
+```yaml
+models:
+  - from: huggingface:huggingface.co/spiceai/darts:latest
+    name: drive_stats
+    files:
+      - model.onnx
+    datasets:
+      - drive_stats_inferencing
+```
+
+Relative path example:
+
+`spicepod.yaml`
+```yaml
+models:
+  - from: models/drive_stats
+```
+
+`models/drive_stats/model.yaml`
+```yaml
+models:
+  - from: spiceai:spice.ai/lukekim/smart/models/drive_stats:latest
+    name: drive_stats
+    datasets:
+      - drive_stats_inferencing
+```
+
+## `name`
+
+The name of the model. This is used to reference the model in the pod manifest, as well as in external data sources.
+
+## `from`
+
+The `from` field is a string that represents the Uniform Resource Identifier (URI) for the model. This URI is composed of two parts: a prefix indicating the source of the model, and the actual link to the model.
+
+The syntax for the `from` field is as follows:
+
+```yaml
+from: <source>:<link>:<version>
+```
+
+Where:
+
+- `<source>`: The source of the model
+
+  Currently supported sources:
+  - [`spiceai`]({{<ref "machine-learning/model-deployment/spiceai">}})
+  - [`huggingface`]({{<ref "machine-learning/model-deployment/huggingface">}})
+
+- `<link>`: The actual link to the model.
+
+- `<version>`: The version of the model. This is optional and if not specified, the latest version of the model will be used.
+
+## `datasets`
+
+An array of dataset names needed for the model.
+
+## `files`
+
+Only for Huggingface models. List of model files to download from Huggingface.
+
+```yaml
+files:
+  - model.onnx
+  - model.onnx.data
+  ...
+```
+