Add change note

tamasvajk · tamasvajk · commit b4bd7af9c86a · 2021-04-23T13:40:12.000+02:00
diff --git a/csharp/change-notes/2021-04-23-model-error-extraction.md b/csharp/change-notes/2021-04-23-model-error-extraction.md
@@ -0,0 +1,2 @@
+lgtm,codescanning
+* Program model errors are now extracted in standalone extraction.

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	`+lgtm,codescanning`
	`2`	`+* Program model errors are now extracted in standalone extraction.`