Add what's new section

mkdocs-website/docs/whats-new.md

@@ -0,0 +1,40 @@
+# What's new in v3?
+
+!!! note
+        The features that will be included in the v3 release may change from this list.
+
+## Multiple Windows
+
+It's now possible to create multiple windows and configure each one independently. 
+
+## Systrays
+
+Systrays allow you to add an icon in the system tray area of your desktop and have the following features:
+    - Attach window (the window will be centered to the systray icon)
+    - Full menu support 
+    - Light/Dark mode icons
+
+## Plugins
+
+Plugins allow you to extend the functionality of the Wails system. Not only can plugin methods be used in Go, but also called from Javascript. Included plugins:
+  - kvstore - A key/value store
+  - browser - open links in a browser
+  - log - custom logger
+  - oauth - handles oauth authentication and supports 60 providers
+  - single_instance - only allow one copy of your app to be run
+  - sqlite - add a sqlite db to your app. Uses the modernc pure go library
+  - start_at_login - Register/Unregister your application to start at login
+
+## Improved bindings generation
+
+v3 uses a new static analyser to generate bindings. This makes it extremely fast and maintains comments and parameter names in your bindings.
+
+## Improved events
+
+Events are now emitted for a lot of the runtime operations, allowing you to hook into application/system events. Cross-platform (common) events are also emitted where there are common platform events, allowing you to write the same event handling methods cross platform.
+
+Event hooks can also be registered. These are like the `On` method but are synchronous and allow you to cancel the event. An example of this would be to show a confirmation dialog before closing a window. 
+
+## Wails Markup Language (wml)
+
+An experimental feature to call runtime methods using plain html, similar to [htmx](https://htmx.org).

mkdocs-website/mkdocs.yml

@@ -80,6 +80,7 @@ nav:
 #    - Links: community/links.md
     - Next Steps: getting-started/next-steps.md
     - Feedback: getting-started/feedback.md
+  - What's New in v3?: whats-new.md
   - Development:
     - Introduction: development/introduction.md
     - Status: development/status.md