Add release notes for ODFE 1.7.0 (#109)

release-notes/release-notes-odfe-1.7.0.md

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+## Open Distro for Elasticsearch 1.7.0 Release Notes
+
+## Initial Release
+The Anomaly Detection Kibana plugin provides a Kibana view for the [Anomaly Detection Elasticsearch plugin](https://github.com/opendistro-for-elasticsearch/anomaly-detection).
+
+Anomaly detection uses the Random Cut Forest (RCF) algorithm for detecting anomalous data points in streaming time series. 
+
+You can use the plugin with the same version of the [Open Distro Alerting Kibana plugin](https://github.com/opendistro-for-elasticsearch/alerting-kibana-plugin) to get alert notifications. You can create a monitor based on an anomaly detector directly on the Alerting Kibana plugin. Monitors run checks on the anomaly detection results regularly and trigger alerts based on custom trigger conditions.
+
+## Features
+
+1. Create an anomaly detector on an index and configure features for the detector
+2. Preview sample anomaly results for historical data
+3. Monitor live anomalies
+4. Review anomaly history together with alerts
+
+## Current Limitations
+
+- Supports Elasticsearch / Kibana 7.6.1.
+- Page may load slowly if you load/review data in a long time range.
+- Not all API calls have complete error handling.
+- We will continuously add new unit test cases, but we don't have 100% unit test coverage for now. This is a great area for developers from the community to contribute and help improve test coverage.
+- Please see documentation links and GitHub issues for other details.