Add CHANGELOG to the repository

Author: Anaethelion

CHANGELOG.md

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+# 8.2.0
+## Client
+
+* Fixed a serialisation error for `retry_on_conflict` in the BulkIndexer. Thanks to @lpflpf for the help!
+* Fixed a concurrent map error in the BulkIndexer when custom headers are applied. Thanks to @chzhuo for the contribution! 
+
+## API
+
+**New APIs**
+
+* `Cat.ComponentTemplates`
+* `ML.GetMemoryStats` [documentation](https://www.elastic.co/guide/en/elasticsearch/reference/current/get-ml-memory.html)
+
+* `Security.activateUserProfile` (Experimental API) [Documentation](https://www.elastic.co/guide/en/elasticsearch/reference/current/security-api-activate-user-profile.html)
+* `Security.disableUserProfile` (Experimental API) [Documentation](https://www.elastic.co/guide/en/elasticsearch/reference/master/security-api-disable-user-profile.html)
+* `Security.enableUserProfile` (Experimental API) [Documentation](https://www.elastic.co/guide/en/elasticsearch/reference/master/security-api-enable-user-profile.html)
+* `Security.getUserProfile` (Experimental API) [Documentation](https://www.elastic.co/guide/en/elasticsearch/reference/current/security-api-get-user-profile.html)
+* `Security.suggestUserProfiles` (Experimental API) [Documentation](https://www.elastic.co/guide/en/elasticsearch/reference/master/security-api-suggest-user-profile.html)
+* `Security.updateUserProfileData` (Experimental API) [Documentation](https://www.elastic.co/guide/en/elasticsearch/reference/current/security-api-update-user-profile-data.html)
+
+# 8.1.0
+## API
+
+ * API is generated from the Elasticsearch 8.1.0 specification.
+
+**New parameters**
+
+* `WithWaitForCompletion` for `Indices.Forcemerge` 
+* `WithFeatures` for `Indices.Get`
+* `WithForce` for `ML.DeleteTrainedModel`
+
+**New APIs**
+
+* `OidcAuthenticate`, `OidcLogout` and `OidcPrepareAuthentication` [see documentation](https://www.elastic.co/guide/en/elasticsearch/reference/current/security-api.html#security-openid-apis)
+* `TransformResetTransform`
+
+# 8.0.0
+## Client
+
+ * The client now uses `elastic-transport-go` dependency which lives in its [own repository](https://github.com/elastic/elastic-transport-go/).
+ * With the knewly extracted transport, the `retryOnTimeout` has been replaced with a `retryOnError` callback. This allows to select more finely which error should be retried by the client.
+ * `BulkIndexerItem` `Body` field is now an `io.ReadSeeker` allowing reread without increasing memory consumption.
+ * `BulkIndexerItem` know correctly uses the `routing` property instead of the deprecated `_routing`.
+
+## API
+
+ * API is generated from the Elasticsearch 8.0.0 specification.
+
+
+
+