Add a directory for 3.0 migration guide entries
Similarly to ChangeLog.d, we want to avoid endless merge conflicts.
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/docs/3.0-migration-guide.d/00README b/docs/3.0-migration-guide.d/00README
new file mode 100644
index 0000000..0578eaa
--- /dev/null
+++ b/docs/3.0-migration-guide.d/00README
@@ -0,0 +1,7 @@
+Please add your migration guide entries here. (This works similarly to
+ChangeLog.d except merging will be done manually.)
+
+Each entry should help a user answer these questions:
+
+- am I affected?
+- what's my migration path?