Add a DEPRECATIONS file if any advance warning is needed

Author: ibmmqmet

DEPRECATIONS.md

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+# API Deprecations
+This file lists any deprecated function in the `mq-golang` repository.
+
+Current API version for the `ibmmq` and `mqmetric` packages is **v5**.
+
+Removal of function will only happen with a major version
+change.
+
+**Note:** There is no date currently planned for a new major release.
+
+## In next major version
+The following interfaces are planned to be removed:
+#### Package ibmmq
+* PutDate and PutTime fields in the MQMD and MQDLH structures
+  * Replacement is the single PutDateTime time.Time type
+
+#### Package mqmetric
+* Remove direct access to xxxStatus variables.
+  * Use GetObjectStatus() instead
+
+The replacement APIs are already available in the v5 stream.
+
+## Previous deprecations
+None so far.