Add archival notice to README

Added an archival notice explaining the project's status and maintenance.

Author: germanoeich

README.md

@@ -1,3 +1,8 @@
+# Archival notice
+Thanks for all the support. This project was born out of a need within Dyno, and I'm glad it ended up being useful to many other bot creators as well.
+
+Unfortunately, I no longer have the time or capacity to maintain it. I’ve since stepped away from Discord bot development and I’m no longer active enough in the ecosystem to keep up with ongoing changes. Because of that, I’ve decided to archive this project.
+
 # Nirn-proxy
 Nirn-proxy is a highly available, transparent & dynamic HTTP proxy that 
 handles Discord ratelimits for you and exports meaningful prometheus metrics.
@@ -125,4 +130,4 @@ The proxy can be profiled at runtime by enabling the ENABLE_PPROF flag and brows
 ##### Acknowledgements
 - [Eris](https://github.com/abalabahaha/eris) - used as reference throughout this project
 - [Twilight](https://github.com/twilight-rs) - used as inspiration and reference
-- [@bsian](https://github.com/bsian03) & [@bean](https://github.com/beanjo55) - for listening to my rants and providing assistance
+- [@bsian](https://github.com/bsian03) & [@bean](https://github.com/beanjo55) - for listening to my rants and providing assistance