[Docs] Convert rST to MyST (Markdown) (#11145)

Signed-off-by: Rafael Vasquez <rafvasq21@gmail.com>

docs/source/design/multimodal/multimodal_index.md

@@ -0,0 +1,83 @@
+(multi-modality)=
+
+# Multi-Modality
+
+```{eval-rst}
+.. currentmodule:: vllm.multimodal
+```
+
+vLLM provides experimental support for multi-modal models through the {mod}`vllm.multimodal` package.
+
+Multi-modal inputs can be passed alongside text and token prompts to [supported models](#supported-mm-models)
+via the `multi_modal_data` field in {class}`vllm.inputs.PromptType`.
+
+Currently, vLLM only has built-in support for image data. You can extend vLLM to process additional modalities
+by following [this guide](#adding-multimodal-plugin).
+
+Looking to add your own multi-modal model? Please follow the instructions listed [here](#enabling-multimodal-inputs).
+
+## Guides
+
+```{toctree}
+:maxdepth: 1
+
+adding_multimodal_plugin
+```
+
+## Module Contents
+
+```{eval-rst}
+.. automodule:: vllm.multimodal
+```
+
+### Registry
+
+```{eval-rst}
+.. autodata:: vllm.multimodal.MULTIMODAL_REGISTRY
+```
+
+```{eval-rst}
+.. autoclass:: vllm.multimodal.MultiModalRegistry
+    :members:
+    :show-inheritance:
+```
+
+### Base Classes
+
+```{eval-rst}
+.. autodata:: vllm.multimodal.NestedTensors
+```
+
+```{eval-rst}
+.. autodata:: vllm.multimodal.BatchedTensorInputs
+```
+
+```{eval-rst}
+.. autoclass:: vllm.multimodal.MultiModalDataBuiltins
+    :members:
+    :show-inheritance:
+```
+
+```{eval-rst}
+.. autodata:: vllm.multimodal.MultiModalDataDict
+```
+
+```{eval-rst}
+.. autoclass:: vllm.multimodal.MultiModalKwargs
+    :members:
+    :show-inheritance:
+```
+
+```{eval-rst}
+.. autoclass:: vllm.multimodal.MultiModalPlugin
+    :members:
+    :show-inheritance:
+```
+
+### Image Classes
+
+```{eval-rst}
+.. automodule:: vllm.multimodal.image
+    :members:
+    :show-inheritance:
+```