Add msrv to readme

Author: diondokter

README.md

@@ -39,6 +39,16 @@ That way you've covered the worst-case execution time for that part of your appl
 
 A cache performance regression might be a bug though. Open an issue to discus your situation if you find a regression.
 
+## MSRV
+
+This crate has no further guarantees other than being able to run on the latest stable compiler.  
+Increasing the MSRV is not seen as a breaking change semver-wise.  
+If you find yourself in trouble with this, feel free to open an issue.
+
+## Example
+
+See the `map` and `queue` module level documentation for examples.
+
 ## Features
 
 - Key value datastore (Map)