add twitter link

Author: calimarkus

README.md

@@ -13,6 +13,8 @@ This app was originally written for iOS3. That's before GCD & ARC was available,
 
 It's an app, which @martinstolz and me wrote together as a side project to learn iOS development. So don't take this as an architectural marvel, but instead as a small window into the history of iOS development. We continued to maintain and update it for another 10 years until we took it out of the appstore in 2020. 
 
+Here's a small twitter (ehm "X") thread with some additional background, highlighting a few of our choices too: https://twitter.com/calimarkus/status/1731789068709625912
+
 ### Source code
 
 We are open sourcing the source code of two versions of the app here. Both still compile and run on today's Xcode 15: