update README for discovery service

add the method of starting discovery service Signed-off-by: Yin Congmin <[email protected]>
ceph · Sep 6, 2023 · aa34589 · aa34589
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diff --git a/README.md b/README.md
@@ -238,6 +238,15 @@ Once the NVMe-oF target is
     Hello NVMe-oF
     ```
 
+### Start Discovery Service(Optional)
+
+The discovery service can provide all the targets that the current user can access, and these target information is sourced from ceph omap. These targets may be running or just a record.
+
+1. Start Discovery Service
+    ```bash
+    $ python3 -m control.discovery
+    ```
+
 ## Advanced
 
 ### Configuration