Add event RPC API index page

Author: bubelov

docs/rpc/event/README.md

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+# Event RPC
+
+Methods for managing Bitcoin-related events shown on BTC Map. Most events are
+either conferences or recurring community meetups, pinned to a fixed location
+via `(lat, lon)` and optionally linked to an [area](../area-methods.md).
+
+Each event has its own row in the `event` table. Deletion is soft (`deleted_at`
+is set); use `get_events` with `include_deleted` to surface tombstones, and
+`include_past` to surface events whose `starts_at` is already in the past.
+Events without a `starts_at` are treated as permanent and are always returned
+by `get_events`.
+
+If the calling user has a non-empty
+[geofence](../user-methods.md#set_user_geofence), `create_event`,
+`update_event`, and `delete_event` enforce that the event falls inside the
+geofence (via `area_id` or via its `(lat, lon)`). This applies equally to
+root, admin, and event manager callers.
+
+- [create_event](create_event.md) - Add a new event
+- [get_event](get_event.md) - Retrieve a single event by id
+- [get_events](get_events.md) - List events, with optional past/deleted filtering
+- [update_event](update_event.md) - Partially update an existing event
+- [delete_event](delete_event.md) - Soft-delete an event