Changelog file added

Author: viktor-kopp-pix4d

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+
+## [Unreleased]
+
+### Added
+
+### Changed
+
+### Removed
+
+
+## QtBasemapPlugin 1.1.0-1
+
+### Added
+- new "Custom"-MapType option which fetches map tiles from a custom url. When [Map QML Type](https://doc.qt.io/qt-5/qml-qtlocation-map.html) is used,
+the new map type can be chosen as [activeMapType](https://doc.qt.io/qt-5/qml-qtlocation-map.html#activeMapType-prop).
+
+### Changed
+- if [plugin](https://doc.qt.io/qt-5/qml-qtlocation-plugin.html) is instantiated with custom url parameter, the switch between Satellite, Street (provided by mapbox) 
+and Custom tiles (provided via custom basemap url) can be done without plugin [reinstantiation](https://doc.qt.io/qt-5/qml-qtlocation-map.html#plugin-prop)
+