Add documentation for custom workflow templates feature

essentials/comms_routes.mdx

@@ -19,6 +19,7 @@ The prompt queue is defined in `execution.py`, which also defines the `PromptExe
 |`/`|get|load the comfy webpage|
 |`/embeddings`|get|retrieve a list of the names of embeddings available|
 |`/extensions`|get|retrieve a list of the extensions registering a `WEB_DIRECTORY`|
+|`/workflow_templates`|get|retrieve a map of custom node modules and associated template workflows|
 |`/upload/image`|post|upload an image|
 |`/upload/mask`|post|upload a mask|
 |`/view`|get|view an image. Lots of options, see `@routes.get("/view")` in `server.py`|

essentials/custom_node_workflow_templates.mdx

@@ -0,0 +1,22 @@
+---
+title: "Workflow templates"
+---
+
+If you have example workflow files associated with your custom nodes 
+then ComfyUI can show these to the user in the template browser (`Workflow`/`Browse Templates` menu). 
+Workflow templates are a great way to support people getting started with your nodes.
+
+All you have to do as a node developer is to create an `example_workflows` folder and place the `json` files there. 
+Optionally you can place `jpg` files with the same name to be shown as the template thumbnail.  
+
+Under the hood ComfyUI statically serves these files along with an endpoint (`/api/workflow_templates`) 
+that returns the collection of workflow templates.
+
+## Example
+
+Under `ComfyUI-MyCustomNodeModule/example_workflows/` directory:
+ - `My_example_workflow_1.json`
+ - `My_example_workflow_1.jpg`
+ - `My_example_workflow_2.json`
+
+In this example ComfyUI's template browser shows a category called `ComfyUI-MyCustomNodeModule` with two items, one of which has a thumbnail.

mint.json

@@ -115,7 +115,8 @@
                 "essentials/comms_messages",
                 "essentials/comms_routes"
               ]
-            }
+            },
+            "essentials/custom_node_workflow_templates"
           ]
         },
         "essentials/models",