Introduce CHANGELOG.md (#5)

CHANGELOG.md

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+# Changelog
+
+## [1.0.0-alpha] - 2023-05-25
+The first release for the new Braiins OS+ Public API, which introduces the first batch of features.
+
+##### Actions
+With actions from `ActionService`, user can start/stop/restart/pause/resume mining (BOS+). Reboot of the whole miner is supported as well.
+
+##### Configuration
+With `ConfigurationService` methods, user can read current miner configuration and configuration constraints.
+
+##### Cooling
+With `CoolingService`methods, user can read current state of fans or current temperatures, or configure immersion mode.
+
+##### Miner
+With `MinerService` methods, user can read miner HW details, overall miner or hashboards statistics.
+
+##### Pools
+With `PoolService` methods, user can read all currently used pool groups, as well as update a specific pool group.
+
+##### Tuner
+With `TunerService` methods, user can read current tuner state and configure tuner power target.
+
+##### Other
+Overall to use gRPC API, user must be authenticated. For this purpose, `AuthenticationService` with `Login` method is present.
+
+The method in `VersionService` provides information about a particular version of the public Braiins OS+ API.