Update readme and license

README.md

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-# traccar_client
+# [Traccar Client app](https://www.traccar.org/client)
 
-A new Flutter project.
+[![Get it on Google Play](http://www.tananaev.com/badges/google-play.svg)](https://play.google.com/store/apps/details?id=org.traccar.client) [![Download on the App Store](http://www.tananaev.com/badges/app-store.svg)](https://itunes.apple.com/app/traccar-client/id843156974)
+
+## Overview
+
+Traccar Client is a GPS tracking app for Android and iOS. It runs in the background and sends location updates to your own server using the open-source Traccar platform.
+
+- **Real-time Tracking**: See your device’s location on your private server in real time.
+- **Open-Source**: 100% free and open-source, with no ads or tracking.
+- **Customizable**: Configure update intervals, accuracy, and data usage to fit your needs.
+- **Privacy First**: Your location data is sent only to your chosen server—never to third parties.
+- **Easy Integration**: Designed to work seamlessly with the Traccar server and many third-party GPS tracking platforms.
+
+Just enter your server address, grant location permissions, and the app will automatically send periodic location reports in the background.
+
+## Team
+
+- Anton Tananaev ([anton@traccar.org](mailto:anton@traccar.org))
+
+## License
+
+    Apache License, Version 2.0
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.