docs: Create initial 0.9.9.md

Author: makspll

release-notes/0.9.9.md

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+# [`bevy_mod_scripting`](https://github.com/makspll/bevy_mod_scripting/) 0.9.9 is out!
+
+![image](https://github.com/user-attachments/assets/6ae0f927-ea1b-4d90-a809-4cc513e49b18)
+
+## Summary 
+- Dynamic Systems are here! [^1]
+  - TODO
+- `WithWorldGuard` and `HandlerContext<Plugin>` system parameters can be used in conjunction to create custom event handler systems
+   ```rust
+   fn my_handler(with_guard: WithWorldGuard<HandlerContext<Plugin>>) {
+       let (guard, ctxt) = with_guard.get_mut();
+       ctxt.call("my_script.lua", ...)
+   }
+   ``` 
+- Global functions are now exported via the `ladfile_builder` plugin, BMS globals can be seen in the book
+- `HashMap` fields can now be set by reflection
+- Tuples now have a `FromScript` implementation
+
+## Fixes
+- `callback_labels!` allows for trailing commas
+- `enable_context_sharing` not having a builder signature
+- `HashMap`'s `FromReflect` supports `Vec` types meaning empty Lua maps `{}` work as expected 
+
+## Changelog
+See a detailed changelog [here](https://github.com/makspll/bevy_mod_scripting/blob/main/CHANGELOG.md)
+
+[^1] Experimental and early in development but here!