login: add page (#17617)

* Update pages/cisco-ios/login.md

Co-authored-by: Dylan <[email protected]>

Author: Managor

pages/cisco-ios/login.md

@@ -0,0 +1,9 @@
+# login
+
+> Manage line transport protocols.
+> Accessed in configuration mode under `line`.
+> More information: <https://www.cisco.com/c/en/us/td/docs/routers/sdwan/command/iosxe/qualified-cli-command-reference-guide/m-line-commands.pdf>.
+
+- Use local username and password for authentication:
+
+`login local`