added basic information to bw's doc

Author: fer

crates/bw/README.md

@@ -1,3 +1,50 @@
 # Bitwarden CLI (testing)
 
 A testing CLI for the Bitwarden Password Manager SDK.
+
+## Authentication
+
+### Login with API Key
+
+```bash
+# With environment variables
+export BW_CLIENTID="user.xxx"
+export BW_CLIENTSECRET="xxx"
+export BW_PASSWORD="xxx"
+bw login api-key
+
+# Or with interactive prompts
+bw login api-key
+```
+
+The login command returns a session key that can be used for subsequent commands.
+
+### Using Sessions
+
+```bash
+# Save session to environment variable
+export BW_SESSION="<session-key-from-login>"
+
+# Or pass directly to commands
+bw list items --session "<session-key>"
+```
+
+## Commands
+
+### List Items
+
+```bash
+# List all items
+bw list items
+
+# Search items
+bw list items --search "github"
+
+# Filter by folder, collection, or organization
+bw list items --folderid "<folder-id>"
+bw list items --collectionid "<collection-id>"
+bw list items --organizationid "<org-id>"
+
+# Show deleted items
+bw list items --trash
+```