[polly] Add a Maintainers.md file

Author: DavidSpickett

llvm/Maintainers.md

@@ -442,16 +442,13 @@ Others only have a lead maintainer listed here.
 
 [LLVM OpenMP Library maintainers](https://github.com/llvm/llvm-project/blob/main/openmp/Maintainers.md)
 
+[Polly maintainers](https://github.com/llvm/llvm-project/blob/main/polly/Maintainers.md)
+
 #### libclc
 
 Tom Stellard \
 [email protected] (email), [tstellar](https://github.com/tstellar) (GitHub)
 
-#### Polly
-
-Tobias Grosser \
-[email protected] (email), [tobiasgrosser](https://github.com/tobiasgrosser) (GitHub)
-
 ## Inactive Maintainers
 
 The following people have graciously spent time performing maintainer

polly/Maintainers.md

@@ -0,0 +1,10 @@
+# Polly Maintainers
+
+This file is a list of the
+[maintainers](https://llvm.org/docs/DeveloperPolicy.html#maintainers) for
+Polly.
+
+# Lead maintainer
+
+Michael Kruse \
+[email protected] (email), [Meinersbur](https://github.com/Meinersbur) (GitHub)