DOC: start adding a changelog

docs/changelog.md

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 # Changelog
 
+## 2.3 (2025-XX-XX)
+
+### Major Changes
+
+- Binary elementwise functions now accept python scalars: the only requirement is that
+  at least one of the arguments must be an array; the other argument may be either
+  a python scalar or an array. Python scalars are handled in accordance with the
+  type promotion rules, as specified by the standard.
+  This change unifies the behavior of binary functions and their matching operators,
+  (where available), such as `multiply(x1, x2)` and `__mul__(self, other)`.
+
+  ``where`` accepts array or scalars as its 2nd and 3rd arguments, ``x1`` and ``x2``. The first argument, ``condition``, must be an array.
+
+- The following functions, new in the 2024.12 standard revision, are implemented:
+
+  - `count_nonzero`
+  - `cumulative_prod`
+
+
+### Minor Changes
+
+- `vecdot` now conjugates the first argument, in accordance with the standard.
+
+- `astype` now raises a `TypeError` instead of casting a complex floating-point
+  array to a real-valued or an integral data type.
+
+- `where` requires that its first argument, `condition` has a boolean data dtype,
+  and raises a `TypeError` otherwise.
+
+- `isdtype` raises a `TypeError` is its argument is not a dtype object.
+
+- arrays created with `from_dlpack` now correctly set their `device` attribute.
+
+- `mean` accepts complex floating-point arrays.
+
+
+### Contributors
+
+The following users contributed to this release:
+
+Aaron Meurer
+Clément Robert
+Guido Imperiale
+Evgeni Burovski
+Lucas Colley
+Tim Head
+
+
+
 ## 2.2 (2024-11-11)
 
 ### Major Changes