Improve readme (#25)

* Improve readme

* changelog

---------

Co-authored-by: Kailin <kailin-huang@outlook.com>

CHANGELOG.md

@@ -0,0 +1,63 @@
+# Changelog
+
+_For questions about compatibility, please contact Fixpositions Support support@fixposition.com_
+
+## [6.1.3](https://github.com/fixposition/fixposition_driver/releases/tag/6.1.3)
+
+    - Improve README
+
+## [6.1.2](https://github.com/fixposition/fixposition_driver/releases/tag/6.1.2)
+
+    - Bugfix gnss message timestamps
+
+## [6.1.1](https://github.com/fixposition/fixposition_driver/releases/tag/6.1.1)
+
+    -   Bugfix for serial connection
+    -   Add frame_id for imu messages
+
+## [6.1.0](https://github.com/fixposition/fixposition_driver/releases/tag/6.1.0)
+
+    -   Add feature to publish GNSS Antenna positions even if Fusion is not initialized. NOV_B-BESTGNSSPOS is used and sensor_msgs::NavSatFix is published. See more details in [Vision-RTK2 GNSS Antenna Positions](#Vision-RTK2-GNSS-Antenna-Positions).
+
+## [6.0.3](https://github.com/fixposition/fixposition_driver/releases/tag/6.0.3)
+
+    -   Fix Frame ID of FP_POI in LLH converter
+    -   Bugfix of sending empty TFs
+    -   Fix wrong gnss status
+    -   Remove 'WsCallback' warning
+    -   Add ci file for ROS
+
+## [6.0.2](https://github.com/fixposition/fixposition_driver/releases/tag/6.0.2)
+
+    -   Add missing depencency of `tf2_eigen` in `fixposition_driver_ros2/CMakeList.txt`
+
+## [6.0.1](https://github.com/fixposition/fixposition_driver/releases/tag/6.0.1)
+
+    -   Adapted to be compatible with updated Fixposition message definitions
+    -   **Compatible with Vision-RTK 2 software released after 09.03.2023**
+
+## [5.0.0](https://github.com/fixposition/fixposition_driver/releases/tag/5.0.0)
+
+    -   Support both ROS1 and ROS2
+    -   Diverse bugfixes in code and documentation
+    -   **This is the last version compatible with Vision-RTK 2 software released before 17.01.2023**
+
+## [4.4.0](https://github.com/fixposition/fixposition_driver/releases/tag/4.4.0)
+
+    -   Pitch-Roll estimation from IMU data parsed from Vision-RTK 2, output available before fusion initialization.
+    -   OdometryConverter imeplemented as an example for wheelspeed data integration.
+
+## [4.3.0](https://github.com/fixposition/fixposition_driver/releases/tag/4.3.0)
+
+    -   Automatic reconnect after connection is lost
+    -   Adaption to latest Vision-RTK 2 software changes
+
+## [4.2.0](https://github.com/fixposition/fixposition_driver/releases/tag/4.2.0)
+
+    -   Euler Angle Yaw-Pitch-Roll in local ENU frame
+    -   Odometry in fixed ENU0 frame
+
+## [4.0.1](https://github.com/fixposition/fixposition_driver/releases/tag/4.0.1)
+
+    -   First public release
+    -   Code cleanup