C#: Add change note

Author: hvitved

change-notes/1.24/analysis-csharp.md

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+# Improvements to C# analysis
+
+The following changes in version 1.24 affect C# analysis in all applications.
+
+## General improvements
+
+## New queries
+
+| **Query**                   | **Tags**  | **Purpose**                                                        |
+|-----------------------------|-----------|--------------------------------------------------------------------|
+
+## Changes to existing queries
+
+| **Query**                  | **Expected impact**    | **Change**                                                       |
+|----------------------------|------------------------|------------------------------------------------------------------|
+
+## Changes to libraries
+
+* The taint tracking library now tracks flow through (implicit or explicit) conversion operator calls.