add CHANGELOG-2.5.md

Signed-off-by: ilixiaocui <[email protected]>

CHANGELOG-2.5.md

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+# CHANGELOG of v2.5
+
+Previous change logs can be found at [CHANGELOG-2.4](https://github.com/opencurve/curve/blob/master/CHANGELOG-2.4.md)
+
+
+
+## New Features
+
+- Memcache support
+    - [curvefs/client: support memcached cluster](https://github.com/opencurve/curve/pull/2096) @ilixiaocui
+    - [curvefs/mds: support memcache cluster](https://github.com/opencurve/curve/pull/2108) @Cyber-SiKu
+    - [curvefs/client: add global cache client like memcached](https://github.com/opencurve/curve/pull/2102) @fansehep
+    - [curvefs/client: fix client core dump error](https://github.com/opencurve/curve/pull/2157) @ilixiaocui
+    - [add ut](https://github.com/opencurve/curve/pull/2164) @Cyber-SiKu
+
+- curvefs new tools 
+    - [add delete impl](https://github.com/opencurve/curve/pull/2088) @shentupenghui
+    - [feat: [tools-v2] bs list dir](https://github.com/opencurve/curve/pull/2082) @Sindweller
+    - [fix missing docs links](https://github.com/opencurve/curve/pull/2082) @zyb521
+    - [curve/toos-v2: add list client #2037](https://github.com/opencurve/curve/pull/2076) @tsonglew
+    - [support create volume directory by curve_ops_tool](https://github.com/opencurve/curve/pull/2078) @aspirer
+
+- [install: added playground.](https://github.com/opencurve/curve/pull/2053) @Wine93
+
+## Optimization
+
+- [update the braft to vesion v1.1.2](https://github.com/opencurve/curve/pull/2091) @tangwz
+
+- [curvefs/client: local cache policy optimization](https://github.com/opencurve/curve/pull/2064) @Tangruilin
+
+
+- [sync by threadpool](https://github.com/opencurve/curve/pull/1912) @fansehep
+
+- Merge block storage and file storage compilation scripts
+    - [Merge block storage and file storage compilation scripts
+](https://github.com/opencurve/curve/pull/2089) @linshiyx
+    - [Add help_msg in Makefile](https://github.com/opencurve/curve/pull/2133) @linshiyx
+    - [fix image.sh](https://github.com/opencurve/curve/pull/2124) @SeanHai
+
+- [fix bs list zone typo](https://github.com/opencurve/curve/pull/2066) @tsonglew 
+
+- [spell optimize](https://github.com/opencurve/curve/pull/2059) @shentupenghui
+
+
+## Bug Fix
+
+- aws s3 sdk revert
+    - [revert new s3 sdk due to critical bug](https://github.com/opencurve/curve/pull/2149) @h0hmj
+    - [curvefs/client: change the default value of s3](https://github.com/opencurve/curve/pull/2158) @wuhongsong