Create THIRD-PARTY-NOTICES.TXT (dotnet#24752)

TPN for https://github.com/dotnet/coreclr/blob/a9074bce5e3814db67dbec1c56f477202164d162/tests/src/sizeondisk/sodbench/SoDBench.cs#L738

Author: richlander

tests/src/sizeondisk/sodbench/THIRD-PARTY-NOTICES.TXT

@@ -0,0 +1,25 @@
+.NET Core uses third-party libraries or other resources that may be
+distributed under licenses different than the .NET Core software.
+
+Attributions and license notices for test cases originally authored by
+third parties can be found in the respective test directories.
+
+In the event that we accidentally failed to list a required notice, please
+bring it to our attention. Post an issue or email us:
+
+            dotnet@microsoft.com
+
+The attached notices are provided for information only.
+
+License notice for Stack Overflow
+-------------------------------------
+
+Policy: https://stackoverflow.com/help/licensing
+License: https://creativecommons.org/licenses/by-sa/3.0/
+
+Title: Dealing with commas in a CSV file
+Content: https://stackoverflow.com/a/769713
+Question author: Bob The Janitor -- https://stackoverflow.com/users/55102/bob-the-janitor
+Answer author: harp -- https://stackoverflow.com/users/4525/harpo
+
+Use: https://github.com/dotnet/coreclr/blob/a9074bce5e3814db67dbec1c56f477202164d162/tests/src/sizeondisk/sodbench/SoDBench.cs#L738