add CHANGES file

[ci skip]

CHANGES.md

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+# Change notes
+
+## 1.0.0
+
+This release brings some breaking changes
+
+- Replaced builtin CM server list with automatic discovery via WebAPI or DNS
+- Removed `steam.client.mixins` package
+- Renamed `medium` param to `backend` on `SteamAuthenticator`
+- Added `WebAuth.cli_login()`, handles all steps of the login process
+- Made `password` param optional on `WebAuth`
+- Replaced `cryptography` library with `pycryptodomex`
+- Added `rich_presence` property to `SteamUser`
+- Fixed `create_emergency_codes()` not returning codes
+- Fixed `validate_phone_number()` returning no data
+- Added protos for new chat via unified messages
+- Updated protobufs
+- Removed `SteamClient.change_email()`
+- Removed `SteamClient.create_account()`
+- `SteanClient.unified_messages` now expose errors by returning a tuple `(result, error)`
+- `get_product_info()` now replaces invalid unicode chars
+- Updated `SteamID.is_valid`
+- Updated various Enums