add info on idty view

the goal is to test CI with new feature ;)

res/README.md

@@ -2,6 +2,15 @@
 
 ## Graphql schema and queries for Duniter indexer
 
+Update the schema with:
+
+```sh
+# install graphql client cli
+cargo install graphql_client_cli
+# download schema from node
+graphql-client introspect-schema https://subsquid.gdev.coinduf.eu/graphql --output ./res/indexer-schema.json
+```
+
 ...
 
 ## Metadata
@@ -9,8 +18,10 @@
 To update the scale-encoded Duniter metadata, spawn a node and run the subxt command.
 
 ```sh
+# install subxt
+cargo install subxt
 # spawn a node listening on localhost:9944
 duniter --dev
 # fetch the metadata with subxt
 subxt metadata -f bytes > res/metadata.scale
-```
\ No newline at end of file
+```