Create RELEASE_CHANGELOG.md

Author: VillePihlava

digitransit/RELEASE_CHANGELOG.md

@@ -0,0 +1,14 @@
+# Digitransit OTP Release Summary
+
+## Changelog _20260311_ vs _upstream/dev-2.x_
+
+### Added PRs
+- Move `StreetSearchBuilder` to street module [#7328](https://github.com/opentripplanner/OpenTripPlanner/pull/7328)
+- Mark RecordedCall without ActualDepartureTime as not departed [#7336](https://github.com/opentripplanner/OpenTripPlanner/pull/7336)
+- Update to Java 25 [#7246](https://github.com/opentripplanner/OpenTripPlanner/pull/7246)
+- Reject SIRI messages with missing Order attribute on calls [#7324](https://github.com/opentripplanner/OpenTripPlanner/pull/7324)
+- Add running days to flex routing [#7281](https://github.com/opentripplanner/OpenTripPlanner/pull/7281)
+- Update Entur-specific emission data docs url in Transmodel custom documentation  [#7352](https://github.com/opentripplanner/OpenTripPlanner/pull/7352)
+- Fix booking time calculation for multi-day flex trip searches [#7255](https://github.com/opentripplanner/OpenTripPlanner/pull/7255)
+- Fix empty string handling for `banned.routes` and `banned.agencies` in GTFS API [#7340](https://github.com/opentripplanner/OpenTripPlanner/pull/7340)
+- Throttle and improve GBFS 'Unexpected vehicle type ID' log message [#7399](https://github.com/opentripplanner/OpenTripPlanner/pull/7399)