C#: Add change note

hvitved · hvitved · commit e4247e4ef62a · 2022-03-09T09:19:37.000+01:00
diff --git a/csharp/ql/lib/change-notes/2022-03-07-legacy-env-vars.md b/csharp/ql/lib/change-notes/2022-03-07-legacy-env-vars.md
@@ -0,0 +1,15 @@
+---
+category: breaking
+---
+* The C# extractor no longer supports the following legacy environment variables:
+```
+ODASA_BUILD_ERROR_DIR
+ODASA_CSHARP_LAYOUT
+ODASA_SNAPSHOT
+SEMMLE_DIST
+SEMMLE_EXTRACTOR_OPTIONS
+SEMMLE_PLATFORM_TOOLS
+SEMMLE_PRESERVE_SYMLINKS
+SOURCE_ARCHIVE
+TRAP_FOLDER
+```
