docs(swimm): create doc: A flow in the code

.swm/a-flow-in-the-code.oo0s391m.sw.md

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+---
+title: A flow in the code
+---
+## Introduction
+
+This doc describes the {{SUBJECT}} flow in our system. We will follow its implementation across the various locations so you can understand how the different parts create the full picture.
+
+## Following the flow
+
+<SwmSnippetPlaceholder>
+
+Select the first step where the flow begins - e.g., the entry point, or an API call.
+
+</SwmSnippetPlaceholder>
+
+{{Keep adding snippets from the next steps of the flow}}
+
+## Things to note
+
+{{Who uses this flow and when?}}
+
+<SwmMeta version="3.0.0" repo-id="Z2l0aHViJTNBJTNBZGV2ZWxvcGVyLmZzcyUzQSUzQW1hbnVjcjYxOQ==" repo-name="developer.fss"><sup>Powered by [Swimm](https://app.swimm.io/)</sup></SwmMeta>

.swm/swimm.json

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+{
+    "repo_id": "Z2l0aHViJTNBJTNBZGV2ZWxvcGVyLmZzcyUzQSUzQW1hbnVjcjYxOQ=="
+}