Update CHANGELOG.md

Author: MrClock8163

CHANGELOG.md

@@ -5,6 +5,16 @@ file.
 
 The project uses [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+
+### Added
+
+- Added resection calculation logic
+- Added station calculation (`calc station`) using resection from set
+  measurements
+- Added station uploading (`upload station`) to set station coordinates and
+  orientation
+
 ## v0.3.0 (2025-08-01)
 
 ### Added