Add external events and drivers (#43)

Author: networkfusion

README.md

@@ -29,7 +29,7 @@ The **nanoFramework** Class Libraries are licensed under the [MIT license](LICEN
 
 ## Code of Conduct
 
-This project has adopted the code of conduct defined by the Contributor Covenant to clarify expected behavior in our community.
+This project has adopted the code of conduct defined by the Contributor Covenant to clarify expected behaviour in our community.
 For more information see the [.NET Foundation Code of Conduct](https://dotnetfoundation.org/code-of-conduct).
 
 ### .NET Foundation