Add a changelog

Author: phil-opp

Changelog.md

@@ -0,0 +1,13 @@
+## Breaking
+
+- The level 4 page table is only recursively mapped if the `recursive_level_4_table` feature is enabled.
+- Replace `BootInfo::p4_table_addr` with `RECURSIVE_LEVEL_4_TABLE_ADDR` constant (only present if the cargo feature is enabled)
+- Remove `From<PhysFrameRange>` implemenations for x86_64 `FrameRange`
+  - This only works when the versions align, so it is not a good general solution.
+- Remove unimplemented `BootInfo::package` field.
+- Make `BootInfo` non-exhaustive so that we can add additional fields later.
+
+## Other
+
+- Add a `map_physical_memory` feature that maps the complete physical memory to the virtual address space at `PHYSICAL_MEMORY_OFFSET`.
+- Re-export `BootInfo` at the root.