Added Deprecation notice

Author: andrewsayre

README.md

@@ -1,8 +1,10 @@
+`DEPRECATED:` This project is no longer maintained. If you are interested in taking over ownership, please contact me: andrew at sayre dot net.
+
 # pysmartapp
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-A python implementation of the WebHook-based [SmartThings SmartApp](https://smartthings.developer.samsung.com/develop/guides/smartapps/basics.html) that uses asyncio and the dispatcher pattern to notify callbacks (coroutines or functions) of SmartApp lifecycle events.
+A python implementation of the WebHook-based [SmartThings SmartApp](https://smartthings.developer.samsung.com/develop/guides/smartapps/basics.html) that uses asyncio and the dispatcher pattern to notify callbacks (coroutines or functions) of SmartApp lifecycle events.