C#: Add change note

hvitved · hvitved · commit 36fe72246b9d · 2021-04-14T09:22:16.000+02:00
diff --git a/csharp/change-notes/2021-04-14-customizations.md b/csharp/change-notes/2021-04-14-customizations.md
@@ -0,0 +1,2 @@
+lgtm,codescanning
+* A new library, `Customizations.qll`, has been added, which allows for global customizations that affect all queries.

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	`+lgtm,codescanning`
	`2`	+* A new library, `Customizations.qll`, has been added, which allows for global customizations that affect all queries.