C#: Change notes.

Author: calumgrant

change-notes/1.20/analysis-csharp.md

@@ -0,0 +1,19 @@
+# Improvements to C# analysis
+
+## General improvements
+
+## New queries
+
+| **Query**                   | **Tags**  | **Purpose**                                                        |
+|-----------------------------|-----------|--------------------------------------------------------------------|
+
+## Changes to existing queries
+
+| *@name of query (Query ID)*| *Impact on results*    | *How/why the query has changed*                                  |
+| Off-by-one comparison against container length (cs/index-out-of-bounds) | Fewer false positives | Results have been removed when there are additional guards on the index. |
+
+## Changes to code extraction
+
+## Changes to QL libraries
+
+## Changes to the autobuilder