Add a CHANGELOG to rand_sfc

Author: dhardy

rand_sfc/CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## Unreleased
+
+This is a new implementation by [@tertu-m](https://github.com/tertu-m) and [@dhardy](https://github.com/dhardy/). The prior implementation has been renamed to [sfc-prng](https://crates.io/crates/sfc-prng).
+
+Compared to the prior implementation:
+
+### Changed
+
+- Value-stability is not preserved since constructors use a different number of mixing rounds
+
+### Removed
+
+- The `new` and `new_u64` constructors are not included