Create changelog

Signed-off-by: Lamparter <notlamparter@outlook.com>

Author: Lamparter

.github/CHANGELOG.md

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+# 🌇 DLR Changelog
+
+The license enforces that a changelog of the software is kept if the changes are significant enough; this document gives a rough outline of what's changed in the DLR since it was forked from `IronLanguages/dlr`.
+
+| Commit | Change |
+|--------|--------|
+| [`0288e44`](https://github.com/RiversideValley/Dynamic/commit/0288e4457d4daf99b0fe6fb5f34aec1dfc4a53e2) | Improved GitHub Actions CI |
+| [`a862c6d`](https://github.com/RiversideValley/Dynamic/commit/a862c6de1d086f9d91f973065907d2df67a64969) | Added better README |
+| [`686e13b`](https://github.com/RiversideValley/Dynamic/commit/686e13b98e661437929d2fdac9a10f70bda73087) | Removed .NET 6 |
+| [`13068a5`](https://github.com/RiversideValley/Dynamic/commit/13068a5bfdccc59ed967f77a02a2385ce227c7ae) | Changed infrastructure and moved projects nearer to root |
+| [`33c1325`](https://github.com/RiversideValley/Dynamic/commit/33c1325ec0dc9c22b393f429a8da50b876875dab) | Renamed `Microsoft.*` namespace to `Riverside.*` to allow publishing on NuGet |
+| [`ec74320`](https://github.com/RiversideValley/Dynamic/commit/ec74320579aca1d02013d2294253263e848f448b) | Removed NuGet packaging targets
+
+<!-- | Cell | Cell | -->