Promote security knowledge from community to Microsoft layer

Pure git-mv relocation of the SECURITY domain from the community layer to the Microsoft layer. No content changes.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

microsoft/knowledge/security/compose-permission-sets-with-included-sets.bad.al

@@ -0,0 +1,21 @@
+// Two role-shaped sets, each re-enumerating the same objects. Adding a new
+// Sales table means editing both sets by hand; forgetting one creates a
+// subtle authorization bug where one role was updated and its sibling was not.
+
+permissionset 50110 "Sales Order Processor"
+{
+    Assignable = true;
+    Permissions =
+        tabledata Customer = IM,
+        tabledata "Sales Header" = IMD,
+        tabledata "Sales Line" = IMD;
+}
+
+permissionset 50111 "Sales Viewer"
+{
+    Assignable = true;
+    Permissions =
+        tabledata Customer = R,
+        tabledata "Sales Header" = R,
+        tabledata "Sales Line" = R;
+}