Added CHANGELOG.md file

Author: coot

CHANGELOG.md

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+# Change Log
+
+# Circa 2022.09.27 (pre release)
+
+- Module structure of `MonadSTM` changed to follow `stm` package structure.
+- default `MonadSTM` api implementations inlined into the type class
+- Added `TQueue` and `TBQueue` to `strct-stm` package
+- Added `unGetTQueue` and `unGetTBQueue`
+- Fixed input-output-hk/ouroboros-network#issues2650
+- Added `link2` and `link2Only` and removed `linkTo` and `linkToOnly` to `MonadAsync`
+- Added `TChan`, `TSem` and `TArray`
+- `MonadTraceSTM`: removed proxy argument from `trace.*IO` functions
+- Split `MonadSTM` and `MonadSTM.Strict` into submodules
+- Added `flushTQueue` to `MonadSTM`
+- Added `cast{TQueue,TBQueue,TChan}` to `strict-stm` package