Add missing package-info

Author: sbrannen

spring-core/src/main/java/org/springframework/aot/package-info.java

@@ -0,0 +1,9 @@
+/**
+ * Core package for Spring AOT infrastructure.
+ */
+@NonNullApi
+@NonNullFields
+package org.springframework.aot;
+
+import org.springframework.lang.NonNullApi;
+import org.springframework.lang.NonNullFields;