Add 1Password (#572)

* Add 1Password

* update 1password manifest to includes flag for silent installation

* update 1password description

manifests/AgileBits/1Password/7.4.767.yaml

@@ -0,0 +1,18 @@
+Id: AgileBits.1Password
+Version: 7.4.767
+Name: 1Password
+Publisher: AgileBits
+License: AgileBis, Inc. Terms of Service
+LicenseUrl: https://1password.com/legal/terms-of-service/
+AppMoniker: 1password
+Tags: password
+Description: 1Password remembers all your passwords for you, and keeps them safe and secure behind the one password that only you know.
+Homepage: https://1password.com/
+Installers:
+  - Arch: Neutral
+    Url: https://c.1password.com/dist/1P/win6/1PasswordSetup-7.4.767.exe
+    Sha256: 5593E982AF53243C4575E71BC804506BD58CD05980F6E8A5DCE3799C57DF22AE
+    InstallerType: exe
+    Switches:
+      Silent: --silent
+      SilentWithProgress: --silent