Updated Binary Log (markdown)

Binary-Log.md

@@ -35,4 +35,12 @@ Instead of passing the project/solution to MSBuild.exe you can now pass a binary
 You can use the MSBuild Structured Log Viewer tool to view `.binlog` files:
 https://github.com/KirillOsenkov/MSBuildStructuredLog
 
-# Binary log file format
+# Binary log file format
+
+The implementation of the binary logger is here:
+https://source.dot.net/#Microsoft.Build/Logging/BinaryLogger/BinaryLogger.cs
+https://github.com/Microsoft/msbuild/blob/master/src/Build/Logging/BinaryLogger/BinaryLogger.cs
+
+It is a `GZipStream`-compressed binary stream of serialized `BuildEventArgs` objects. The event args objects are serialized and deserialized using:
+ * https://source.dot.net/#Microsoft.Build/Logging/BinaryLogger/BuildEventArgsWriter.cs
+ * https://source.dot.net/#Microsoft.Build/Logging/BinaryLogger/BuildEventArgsReader.cs