chore: Create 0.11.0-migration.md

Author: makspll

release-notes/0.11.0-migration.md

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+# Migrating to BMS 0.11.0
+
+### Removal of custom `get` and `set` overrides
+If you were previously registering custom `get` or `set` functions on specific types, 
+these will no longer be searched for by the `lua` and `rhai` implementations. 
+
+If this is a wanted feature, let us know and we might bring it back!
+
+If you are a language implementor, you will need to transition to calling the mini-registry for these.
+
+### Calling `get` and `set` directly in scripts
+Since these have been removed from bindings and moved into an easier to access sub-registry, which is not accessible to scripts directly
+if you used these directly in scripts, i.e. with `my_type:get("field")`, you will have to migrate to the native syntax:
+i.e.:
+```lua
+my_type.field
+my_type["field"]
+my_type["1"]
+my_type._1
+```
+However `map_get` and other `ReflectReference` functions remain where they used to.
+
+
+Happy migrating!