docs: подробный README (разбор проекта при переносе в Gitea)

Старый README сохранён как README.upstream.md.

README.upstream.md

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+# [Traccar Manager for Android](https://www.traccar.org/manager)
+
+[![Get it on Google Play](http://www.tananaev.com/badges/google-play.svg)](https://play.google.com/store/apps/details?id=org.traccar.manager)
+
+## Overview
+
+Traccar Manager is a mobile application to manage GPS tracking devices. It requires a Traccar server instance to work.
+
+## 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.