add Changelog

Author: j-fu

CHANGELOG.md

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+# Changelog
+
+## [1.0] - 2025-12-09
+
+### Features
+
+- Update `pramp` such that it always solves for the first bias.
+- Use one-sided  "upwinded" gradient evolution
+
+Up to now, electric field was evaluated by averaged gradients in the
+inner of the domain and by one-sided gradients at the boundries.
+This inconsistency led to some mesh size dependent and thus unphysical
+concentration jumps in the first and last grid cells.
+
+Now the we always use one-sided evaluation, switching the direction
+in the center of the domain. This gives a seemingly physically more
+consistent picture.
+
+The issue is semi-solved and should be investigated further.
+- Bump version to 1.0
+- Update README
+
+## [0.5.0] - 2025-12-07
+
+Release as presented at Lake arrowhead workshop
+
+* rename internal files
+* rename ICMPBP to SolverCore
+* rename ICMBPData to AugmentedPBData
+* Add SciMLPublic
+* Ensure explicit imports
+* Move code from pluto notebook to normal files
+* Add lots of docs with help of Claude
+
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