update readme to show current state of the crate (#116)

Signed-off-by: Schmarni <[email protected]>

README.md

@@ -4,6 +4,12 @@ A crate for adding openxr support to Bevy ( planned to be upstreamed ).
 
 To see it in action run the example in `examples` with `cargo run --example xr`
 
+## This crate will not recive any feature or performance updates
+the current implementation will not be updated!
+we will release a version for bevy 0.14 once that releases but no further version will be supported!
+there is a new rewrite that will be upstreamed into bevy in the future.
+you can use that from this git repo if you want, but be warned it has a completly different public api.
+
 ## Discord
 
 Come hang out if you have questions or issues