Add a CHANGELOG.md

The intention is we update this file as PRs are merged, so the workload
when making a new release is reduced.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>

CHANGELOG.md

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+# v11-rc1 (2024-Jan-14) 
+
+## Notable features
+
+* picom now uses dithering to prevent banding. Banding is most notable when using a strong background blur. (#952)
+* Frame pacing. picom uses present feedback information to schedule new frames when it makes sense to do so. This improves latency, and replaces the `glFlush` and `GL_MaxFramesAllowed=1` hacks we used to do for NVIDIA. (#968 #1156)
+* Some missing features have been implemented for the EGL backend (#1004 #1007)
+
+## Bug fixes
+
+* Many memory/resource leak fixes thanks to @absolutelynothelix . (#977 #978 #979 #980 #982 #985 #992 #1009 #1022)
+* Fix tiling of wallpaper. (#1002)
+* Fix some blur artifacts (#1095)
+* Fix shadow color for transparent shadows (#1124)
+* Don't spam logs when another compositor is running (#1104)
+* Fix rounded corners showing as black with the xrender backend (#1003)
+* Fix blur with rounded windows (#950)
+
+## Build changes
+
+* Dependency `pcre` has been replaced by `pcre2`.
+* `xinerama` is no longer used.
+
+## Deprecations
+
+* The `kawase` blur method is removed. Note this is just an alias to the `dual_kawase` method, which is still available. (#1102)
+
+# Earlier versions
+
+Please see the GitHub releases page.