add CHANGELOG.md

CHANGELOG.md

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+# RobThree\TwoFactorAuth changelog
+
+# Version 2.x
+
+## Breaking changes
+
+### PHP Version
+
+Version 2.x requires at least PHP 8.1.
+
+### Constructor signature
+
+With version 2.x, the `algorithm` parameter of `RobThree\Auth\TwoFactorAuth` constructor is now an `enum`.
+
+On version 1.x:
+
+~~~php
+use RobThree\Auth\TwoFactorAuth;
+
+$lib = new TwoFactorAuth('issuer-name', 6, 30, 'sha1');
+~~~
+
+On version 2.x, simple change the algorithm from a `string` to the correct `enum`:
+
+~~~php
+use RobThree\Auth\TwoFactorAuth;
+use RobThree\Auth\Algorithm;
+
+$lib = new TwoFactorAuth('issuer-name', 6, 30, Algorithm::Sha1);
+~~~
+
+See the [Algorithm.php](./lib/Algorithm.php) file to see available algorithms.