doc: readme

README.md

@@ -26,10 +26,20 @@ To generate a file for test purpose, especially with a fixed file size or random
 ```
 
 **Upload file**
+
+Use storage nodes urls directly:
+
 ```
 ./0g-storage-client upload --url <blockchain_rpc_endpoint> --contract <0g-storage_contract_address> --key <private_key> --node <storage_node_rpc_endpoint> --file <file_path>
 ```
 
+The `--node` accept comma separated URLs, the client will submit the data segments to all these nodes according to their shard configurations. 
+
+Use indexer url to fetch storage nodes:
+```
+./0g-storage-client upload --url <blockchain_rpc_endpoint> --contract <0g-storage_contract_address> --key <private_key> --indexer <indexer_rpc_endpoint> --file <file_path>
+```
+
 **Download file**
 ```
 ./0g-storage-client download --node <storage_node_rpc_endpoint> --root <file_root_hash> --file <output_file_path>
@@ -38,3 +48,26 @@ To generate a file for test purpose, especially with a fixed file size or random
 To download file from multiple storage nodes **in parallel**, `--node` option supports to specify multiple comma separated URLs, e.g. `url1,url2,url3`.
 
 If you want to verify the **merkle proof** of downloaded segment, please specify `--proof` option.
+
+**Write to KV**
+
+By storage node urls:
+
+```
+./0g-storage-client kv-write --url <blockchain_rpc_endpoint> --contract <0g-storage_contract_address> --key <private_key> --node <storage_node_rpc_endpoint> --stream-id <stream_id> --stream-keys <stream_keys> --stream-values <stream_values>
+```
+
+By indexer:
+```
+./0g-storage-client kv-write --url <blockchain_rpc_endpoint> --contract <0g-storage_contract_address> --key <private_key> --indexer <indexer_rpc_endpoint> --stream-id <stream_id> --stream-keys <stream_keys> --stream-values <stream_values>
+```
+
+`--stream-keys` and `--stream-values` are comma separated string list and their length must be equal.
+
+**Read from KV**
+
+```
+./0g-storage-client kv-read --node <kv_node_rpc_endpoint> --stream-id <stream_id> --stream-keys <stream_keys>
+```
+
+Please pay attention here `--node` is the url of a KV node, different from the command above.