Add RELEASE.md

RELEASE.md

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+Release type: minor
+
+You can now configure your schemas to provide a custom subclass of
+`strawberry.types.Info` to your types and queries.
+
+```py
+import strawberry
+from strawberry.schema.config import StrawberryConfig
+
+from .models import ProductModel
+
+
+class CustomInfo(strawberry.Info):
+    def is_selected(field: str) -> bool:
+        """Check if the field is selected on the top-level of the query."""
+        return field in [sel.name for sel in info.selected_fields]
+
+
+@strawberry.type
+class Product:
+    id: strawberry.ID
+    orders: list[Order]
+
+
+@strawberry.type
+class Query:
+    @strawberry.field
+    def product(self, id: strawberry.ID, info: CustomInfo) -> Product:
+        kwargs = {"id": id}
+
+        if info.is_selected("orders"):
+            # Do some expensive operation here that we wouldn't want to
+            # do if the field wasn't selected.
+            kwargs["orders"] = ...
+
+        return Product(**kwargs)
+
+
+schema = strawberry.Schema(
+    Query,
+    config=StrawberryConfig(info_class=CustomInfo),
+)
+```