Add info for maintainers

MAINTAINERS.md

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+# Release versioning
+
+KES server is released with time based version tags, similar to MinIO server.
+
+To get the release name in the appropriate format, run the following with the code checked out at the desired revision:
+
+```shell
+TZ=UTC0 git show --quiet --date='format-local:%Y-%m-%dT%H-%M-%SZ' --format="%cd"
+```
+
+# Making a release
+
+Set the GITHUB_TOKEN environment variable to the token for the account making the release and run goreleaser:
+
+```shell
+export GITHUB_TOKEN=mytokenvalue
+goreleaser --clean 
+
+```
+
+
+