add sequence diagram to README for better overview of process

README.md

@@ -38,7 +38,9 @@ To integrate a functionality into paperless you need add it as webhook trigger i
 When a webhook gets triggered the document will be added to the processing queue of `paperless-llm-workflows` with the corresponding action. The document will be given a 
 `processing` tag to make paperless users aware that the document still has pending updates. Once all processing requests for a document have been completed the document will 
 be updated with the results and is given a `finished` tag. If you wish to assign a specific tag on process completion there is an extra parameter too the webhook which you 
-can use to overwrite what tag will be assigned once the processing step has completed.
+can use to overwrite what tag will be assigned once the processing step has completed. This process is shown in the following sequence diagram.
+
+![LLM Workflow Sequence](./workflow_api_sequence.svg)
 
 As of now the following llm workflows are availible:
 - `/fill/custom_fields`: For all supported custom fields datatypes extract value from document content

workflow_api_sequence.mmd

@@ -0,0 +1,8 @@
+sequenceDiagram
+    paperless-ngx->>paperless-llm-workflows: /fill/custom_fields { doc_url: "link" }
+    activate paperless-llm-workflows
+    paperless-llm-workflows->>paperless-ngx: set `procssing` tag for document
+
+    paperless-llm-workflows->>paperless-ngx: <br/><br/><br/><br/> update doc with filled custom fields <br/> set `finished` tag
+    deactivate paperless-llm-workflows
+