Added 1password-cli to the knowledge base

knowledge base/1password-cli.md

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+# 1password-cli
+
+## TL;DR
+
+```shell
+# installation
+brew cask install 1password-cli
+
+# first login
+op signin company.1password.com user.name@company.com
+# subsequent logins
+op signin company
+
+# automatically set environment variables
+# needed to run the export command manually
+eval $(op signin company)
+
+# show all the items in the account
+op list items
+```
+
+## Gotchas
+
+- After you have signed in the first time, you can sign in again using your account shorthand, which is your sign-in address subdomain (in this example, _company_); `op signin` will prompt you for your password and output a command that can save your session token to an environment variable:
+
+  ```shell
+  op signin company
+  ```
+
+- Session tokens expire after 30 minutes of inactivity, after which you'll need to sign in again
+
+## Further readings
+
+- [CLI getting started] guide
+- [CLI guide]
+
+[cli getting started]: https://support.1password.com/command-line-getting-started/
+[cli guide]: https://support.1password.com/command-line/