chore: Docs/superset1.3 release notes (apache#16390)

* docs: superset release notes 1.3

* swapped out image

* Update RELEASING/release-notes-1-3/README.md

Co-authored-by: Michael S. Molina <70410625+michael-s-molina@users.noreply.github.com>

* Update RELEASING/release-notes-1-3/README.md

Co-authored-by: Michael S. Molina <70410625+michael-s-molina@users.noreply.github.com>

* Update RELEASING/release-notes-1-3/README.md

Co-authored-by: Michael S. Molina <70410625+michael-s-molina@users.noreply.github.com>

* Update RELEASING/release-notes-1-3/README.md

Co-authored-by: Michael S. Molina <70410625+michael-s-molina@users.noreply.github.com>

Co-authored-by: Junlin Chen <junlin@preset.io>
Co-authored-by: Michael S. Molina <70410625+michael-s-molina@users.noreply.github.com>

RELEASING/README.md

@@ -29,6 +29,8 @@ on the Superset Slack. People crafting releases and those interested in
 partaking in the process should join the channel.
 
 ## Release notes for recent releases
+
+- [1.3](release-notes-1-3/README.md)
 - [1.2](release-notes-1-2/README.md)
 - [1.1](release-notes-1-1/README.md)
 - [1.0](release-notes-1-0/README.md)

RELEASING/release-notes-1-3/README.md

@@ -0,0 +1,73 @@
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+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
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+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+# Release Notes for Superset 1.3
+
+Superset 1.3 focuses on hardening and polishing the superset user experience, with tons of UX improvements and bug fixes focused on charts, dashboards, and the new dashboard-native filters.
+
+- [**User Experience**](#user-experience)
+- [**PR Highlights**](#pr-highlights)
+- [**Breaking Changes and Full Changelog**](#breaking-changes-and-full-changelog)
+
+# User Experience
+One major goal of this release is to improve and harden dashboard-native filters. These filters live at the dashboard level instead of within a chart and affect all charts under their scope within a dashboard. Improvements in this release include clearer visual indicators of what charts are within the scope of a selected filter.
+
+![dashboard native filter scoping](media/dashboard_native_filters_1.jpg)
+
+Native-filters can also be set to load collapsed, which also improves connected thumbnail and alerts/reports functionality.
+
+![dashboard native filter collapsed](media/native_filters_collapsed.png)
+
+For charts, we've added a new funnel chart.
+
+![funnel chart](media/funnel_chart.png)
+
+Users can also now use Jinja templating in calculated columns and SQL metrics.
+
+![jinja templating](media/jinja_templating.png)
+
+At the dashboard level, work has been focused on improving available information and UX ergonomics. Users can now download a full .csv of the full dataset behind a table chart from the dashboard.
+
+![export full csv](media/export_full_csv.png)
+
+Continuing on the theme of making more things accessible directly from the dashboard, users can now view the SQL Query behind any chart directly from the dashboard as well.
+
+![view query dashboard](media/view_query_dashboard.png)
+
+# Developer Experience
+The API has received a new endpoint to allow the developer to pass DB-specific parameters instead of the full SQLAlchemy URI.
+
+# Database Connectivity
+We have improved support for Ascend.io's engine spec and fixed a long list of bugs.
+
+Also in the works is a new database connection UI, which should make connecting to a database easier without having to put together a SQLAlchemy URI. It's behind a feature flag for now, but it can be turned on in config.py with `FORCE_DATABASE_CONNECTIONS_SSL = True`.
+
+# PR Highlights
+
+- [14682](https://github.com/apache/superset/pull/14682) add ascend engine spec (#14682) (@Daniel Wood)
+- [14420](https://github.com/apache/superset/pull/14420) feat: API endpoint to validate databases using separate parameters (#14420) (@Beto Dealmeida)
+- [14934](https://github.com/apache/superset/pull/14934) feat: Adding FORCE_SSL as feature flag in config.py (#14934) (@AAfghahi)
+- [14480](https://github.com/apache/superset/pull/14480) feat(viz): add funnel chart (#14480) (@Ville Brofeldt)
+
+
+
+## Breaking Changes and Full Changelog
+
+- To see the complete changelog in this release, head to [CHANGELOG.MD](../../CHANGELOG.md).
+- 1.3.0 does not contain any backwards incompatible changes.