Add personal prototype disclaimer

Author: ceddc

README.md

@@ -8,6 +8,9 @@ _Disclaimer: this code was 100% generated by AI. It may be good, it may be bad,
 but it works. It achieved the prototype goal I had: checking whether something
 like this could be built._
 
+_This is a personal prototype, not an Esri project. It will probably not move
+much further than this experiment._
+
 Tiny Assistant is a weekend AI experiment about making something like Clippy
 for ArcGIS: a tiny movable assistant character for an ArcGIS web map.