Whats new 2.5 (#1481)

## Changes
What's new in the 2.5

---------

Co-authored-by: Julia Crawford (Databricks) <[email protected]>

packages/databricks-vscode/resources/whats-new/2.5.md

@@ -0,0 +1,67 @@
+<img src="./1.2/databricks-logo.png" alt="databricks-logo" width="100"/>
+
+# Databricks Extension v2.5.0
+
+## What's new?
+
+-   [Pipeline validation and partial update actions](#validation)
+-   [Pipeline events and diagnostics](#events)
+-   [Pipeline datasets](#datasets)
+-   [Quick run action](#quick-run)
+
+### <a id="validation"></a> Pipeline validation and partial update actions
+
+In previous versions, you could only trigger a [Refresh all](https://docs.databricks.com/en/delta-live-tables/updates.html#how-dlt-updates) pipeline update. Now you can do validation and partial updates:
+
+<img src="./2.5/validation.png" alt="validation action" width="600"/>
+
+The partial update action preloads datasets from past runs, and lets you enter table names or select a full refresh:
+
+<img src="./2.5/partial-update.png" alt="partial update action" width="600"/>
+
+### <a id="events"></a> Pipeline events and diagnostics
+
+During and after a pipeline update, the extension now shows events in the resource explorer UI:
+
+<img src="./2.5/events.png" alt="pipeline events" width="600"/>
+
+Any warnings or errors that have source locations are also displayed in the Visual Studio Code **PROBLEMS** panel and highlighted in the source files:
+
+<img src="./2.5/diagnostics.gif" alt="pipeline diagnostics" width="600"/>
+
+### <a id="datasets"></a> Pipeline datasets
+
+You can now see pipeline datasets and their schemas in the extension resource explorer:
+
+<img src="./2.5/datasets.png" alt="pipeline datasets" width="600"/>
+
+Datasets are gathered from the events of past runs, so make sure to update or validate your pipeline at least once.
+
+### <a id="quick-run"></a> Quick run action
+
+Previously, run and update actions were only available from the extension resource explorer UI. Now you can also use a new `Deploy the bundle and run a resource` command from the Command Palette:
+
+<img src="./2.5/run-command-search.png" alt="pipeline datasets" width="600"/>
+
+By default, you select the resource to execute:
+<img src="./2.5/run-command-ui.png" alt="pipeline datasets" width="600"/>
+
+You can also specify a shortcut to run the command with specific arguments.
+
+Open the keyboard shortcuts JSON using the command `Preferences: Open Keyboard Shortcuts (JSON)`. Add a new entry to the `keybindings` array:
+
+```json
+{
+    // Replace with your desired shortcut
+    "key": "ctrl+shift+x",
+    "command": "databricks.bundle.deployAndRunFromInput",
+    "args": {
+        // "jobs" or "pipelines"
+        "resourceType": "pipelines",
+        // The key of the pipeline or job you want to run, as defined in your asset bundle configuration
+        "resourceKey": "my_pipeline_key",
+        // Any flags that will be passed to the "databricks bundle run" command
+        "args": "--validate-only"
+    }
+}
+```