Create CHANGELOG.md

Author: xmrig

CHANGELOG.md

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+# v2.0.0-beta
+- **ABI changed, minimum supported XMRig version now is 4.6.0.**
+- [#5](https://github.com/xmrig/xmrig-cuda/pull/5) Optimized RandomX.
+- [#6](https://github.com/xmrig/xmrig-cuda/issues/6) Fixed compatibility with some old systems.
+- [#7](https://github.com/xmrig/xmrig-cuda/pull/7) Added support for option `dataset_host` for 2 GB GPUs.
+- [#8](https://github.com/xmrig/xmrig-cuda/pull/8) RandomX: fixed random kernel launch errors with some configurations.
+
+# v1.0.0-beta
+- Initial version.