Add the monthly report for December 2024

Author: Byron

etc/monthlies/2024/december.md

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+Let's see what the last month of 2024 will have to offer!
+
+## Tree-Merging - finishing touches
+
+### `.git/index` support 
+
+https://github.com/GitoxideLabs/gitoxide/pull/1661
+
+### Tree-Favor
+
+
+## `gix-protocol` cleanup
+
+https://github.com/GitoxideLabs/gitoxide/pull/1634
+
+## Community
+
+### Revspec with `HEAD@{<date>}` support
+
+https://github.com/GitoxideLabs/gitoxide/pull/1645
+
+### Support for "months ago" and "years ago"
+
+https://github.com/GitoxideLabs/gitoxide/pull/1702
+
+### A very first and humble `gix log`
+
+https://github.com/GitoxideLabs/gitoxide/pull/1643
+
+### Gix in Cargo
+
+Still, there is no news here, and I am still looking forward to finally getting to finalize `gix status` which is the next big step for an improved `Cargo` integration.
+
+#### Cargo-issue with non-ignored device-files in the package directory
+
+https://github.com/GitoxideLabs/gitoxide/pull/1727 
+
+Cheers  
+Sebastian
+
+PS: The latest timesheets can be found [here (2024)](https://github.com/Byron/byron/blob/main/timesheets/2024.csv).