Updates to identity docs.

docs/README.md

@@ -0,0 +1,25 @@
+# General Vault Links and Commands
+
+## Useful commands
+
+Display the `curl` equivalent of a Vault CLI command:
+
+```bash
+vault <any_command> -output-curl-string
+```
+
+The following are equivalent:
+
+```bash
+curl -s -H "X-Vault-Request: true" -H "X-Vault-Token: $VAULT_TOKEN" "https://vault.koszewscy.waw.pl/v1/auth/userpass/users?list=true"
+```
+
+and
+
+```bash
+curl -s -X LIST -H "X-Vault-Request: true" -H "X-Vault-Token: $VAULT_TOKEN" https://vault.koszewscy.waw.pl/v1/auth/userpass/users
+```
+
+because the Vault uses non-standard HTTP method `LIST` for listing resources.
+
+---