add docs content

Author: spyang

docs/curve-interface/curve-cli.md

@@ -1,5 +1,14 @@
 # Curve CLI
 
+- [Create a directory](#create-a-directory)
+- [Delete a directory](#delete-a-directory)
+- [Create a volume](#create-a-volume)
+- [Extend a volume](#extend-a-volume)
+- [Get the volume information](#get-the-volume-information)
+- [List the volumes in a directory](#list-the-volumes-in-a-directory)
+- [Delete a volume](#delete-a-volume)
+- [Code Comparison](#code-comparison)
+
 ### Create a directory
 
 `curve mkdir [-h] --user USER --dirname DIRNAME`

docs/curve-interface/curve-nbd.md

@@ -2,6 +2,11 @@
 
 Map/unmap the curve device.
 
+- [Usage](#usage)
+- [Map](#map)
+- [List mapped](#list-mapped)
+- [Unmap](#unmap)
+
 ### Usage
 
 ```

docs/curve-interface/snapshot-clone-service.md

@@ -1,5 +1,17 @@
 # Curve Snapshot/Clone Interface
 
+- [Create a snapshot](#create-a-snapshot)
+- [Delete a snapshot](#delete-a-snapshot)
+- [Cancel a snapshot](#cancel-a-snapshot)
+- [Query the snapshot information](#query-the-snapshot-information)
+- [Clone](#clone)
+- [Volume recover from a snapshot](#volume-recover-from-a-snapshot)
+- [Flatten](#flatten)
+- [Query the information of the specific clone or recover task](#query-the-information-of-the-specific-clone-or-recover-task)
+- [Clean a clone or recover task](#clean-a-clone-or-recover-task)
+- [Code Comparison](#code-comparison)
+
+
 ## Create a snapshot
 
 | Method | Url |
@@ -209,7 +221,7 @@ Content-Length: xxx
 }
 ```
 
-## Clone 
+## Clone
 
 | Method | Url |
 | --- | --- |
@@ -303,7 +315,7 @@ Content-Length: xxx
 }
 ```
 
-## Flatten: recover lazy-cloned volume 
+## Flatten
 
 | Method | Url |
 | --- | --- |
@@ -346,7 +358,7 @@ Content-Length: xxx
 }
 ```
 
-## Query the information of the specific clone/recover task
+## Query the information of the specific clone or recover task
 
 Get all tasks of the specific user, you can limit with:
 
@@ -424,7 +436,7 @@ Content-Length: xxx
 }
 ```
 
-## Clean a clone/recover task
+## Clean a clone or recover task
 
 Clean the clone/recover task. Delete the temporary cloned file in curvefs server if the task has been failed, otherwise delete the task only.
 
@@ -469,7 +481,7 @@ Content-Length: xxx
 }
 ```
 
-##  Code Comparison
+## Code Comparison
 
 |Code |Message |	HTTP Status Code| Description |
 | --- | --- | --- | --- |