Update CHANGELOG.md

Author: ns-vasilev

CHANGELOG.md

@@ -1,2 +1,12 @@
 # Change Log
-All notable changes to this project will be documented in this file.
+All notable changes to this project will be documented in this file.
+
+#### 1.x Releases
+- `1.0.x` Releases - [1.0.0](#100)
+
+## [1.0.0](https://github.com/space-code/network-layer/releases/tag/1.0.0)
+Released on 2023-12-04.
+
+#### Added
+- Initial release of `network-layer`.
+  - Added by [Nikita Vasilev](https://github.com/nik3212).