Add changelog for Track 2 changes (#40208)

sdk/batch/azure-compute-batch/CHANGELOG.md

@@ -1,13 +1,19 @@
 # Release History
 
-## 1.0.0-beta.1 (Unreleased)
+## 1.0.0-beta.1 (2024-05-16)
 
-- Azure Batch client library for Java. This package contains Microsoft Azure Batch client library.
+- Azure Batch client library for Java. This package contains the Microsoft Azure Batch client library.
 
 ### Features Added
 
-### Breaking Changes
+- Unified Clients: Consolidated multiple smaller clients into two clients: `BatchClient` for synchronous methods and `BatchAsyncClient` for asynchronous methods.
+- Refactored Options: Instead of listing each optional parameter separately in method signatures, a single options object is now used. This object encapsulates all optional parameters.
+- Bulk Task Creation: Added `createTasks` method for bulk task creation (adding multiple tasks to a job at once) to both clients.
 
 ### Bugs Fixed
 
+- Fixed various typos, misspellings, and unclear operation names for improved clarity and consistency.
+
 ### Other Changes
+
+- Removal of Ocp Date Header: The `ocp-date` header has been removed from all SDK operations.