Link to Code of Conduct

Cf. <https://opensource.microsoft.com/codeofconduct/faq/#howadopt>.

Author: cmb69

README.md

@@ -205,3 +205,11 @@ previously.
 - If you experience some strange crashes on MSYS2 tools, try the phpsdk_rebase_msys2 tool. MSYS2 tools might be have unstable
   on ASLR enabled systems.
 
+---
+
+This project has adopted the [Microsoft Open Source Code of
+Conduct](https://opensource.microsoft.com/codeofconduct/).
+For more information see the [Code of Conduct
+FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or
+contact [opencode@microsoft.com](mailto:opencode@microsoft.com)
+with any additional questions or comments.