Add IronDefense custom connector for certification (microsoft#969)

* add IronDefense connector files for certification

* address PR comments

* remove jwt prop

certified-connectors/IronDefense/Readme.md

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+
+## IronDefense Connector
+IronNet provides an external REST API for its flagship product, IronDefense. The
+API allows users to query and modify alerts as well as ingest alert, event, and
+IronDome notifications.
+
+
+
+## Prerequisites
+You will need the following to proceed:
+* The URL where the IronDefense deployment is hosted
+* User login credentials for IronVue with the permissions `Access IronAPI`, `View
+  Alert`, `Edit Alert`, and `Manage Threat Intelligence Rules`
+
+
+## Supported Operations
+The connector supports the following operations:
+* `CommentOnAlert`: Allows a client to comment on any given alert, with the option to send to IronDome (if enrolled).
+* `GetAlertIronDomeInformation`: Allows a client to retrieve community IronDome correlation information for an alert. 
+* `GetAlertNotifications`: Allows a client to retrieve alert notifications from IronDefense without pulling duplicate messages that have already been ingested.
+* `GetAlerts`: Allows a client to retrieve IronDefense alerts in an environment. The response can be filtered based on the alert field parameters and limited to a given number of alerts. 
+* `GetDomeNotifications`: Allows a client to retrieve dome notifications from IronDefense without pulling duplicate messages that have already been ingested.
+* `GetEvent`: Allows a client to retrieve details for an IronDefense event including the event context.
+* `GetEventNotifications`: Allows a client to retrieve event notifications from IronDefense without pulling duplicate messages that have already been ingested.
+* `GetEvents`: Allows a client to retrieve IronDefense events for a particular IronDefense alert. Event context information is not included in these event objects.
+* `Login`: Allows a client to login and retrieve a valid JSON Web Token (JWT) to use in subsequent calls.
+* `RateAlert`: Allows a client to rate an alert as part of the review/triage process.
+* `ReportObservedBadActivity`: Allows a client to submit a domain and/or IP of observed bad activity for Threat Intelligence Rule, event/alert creation and IronDome correlation.
+* `SetAlertStatus`: Allows a client to change an alert's status to progress it through the review process.
+* `UpdateEntityRecord`: Allows a client to send IP lease information from a source of entity information.
+