Add qfield overview

doc/overview/qfield_overview.rst

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+:Author: OSGeoLive
+:License: Creative Commons Attribution 3.0 Unported (CC BY 3.0)
+
+@LOGO_qfield@
+@OSGEO_KIND_qfield@
+
+
+
+@NAME_qfield@
+================================================================================
+
+Mobile GIS
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+`QField for QGIS <https://qfield.org>`_ is a simplified touch optimized interface for QGIS in the field.
+It includes professional tools for data acquisition with surveying grade positioning
+device integration as well as support for a wide variety of advanced attribute
+capturing and mobile mapping functionalities.
+QField is available for Android, iOS, Linux, MacOS and Windows.
+
+It is perfectly integrated with :doc:`QGIS <qgis_overview>` and the development of the two projects
+collaborate closely.
+
+@SCREENSHOT_qfield@
+
+Core Features
+--------------------------------------------------------------------------------
+
+* Friendly graphical user interface:
+    * identify/select features
+    * edit/view/search attributes
+    * on the fly reprojection
+    * beautiful cartography
+    * photo and multimedia capturing
+    * live feedback on data quality via constraints
+
+* Easy Viewing of many Vector and Raster Formats
+    * most vector formats: including ESRI shapefiles, MapInfo, SDTS and GML, OpenStreetMap vectors
+    * raster formats such as digital elevation models, aerial photography or landsat imagery
+    * online web services: WMS, WFS and OGC API
+
+* Exporting data
+    * printing to pdf
+
+* Sensor integration
+    * internal positioning sensors (GNSS)
+    * external positioning sensors via NMEA (bluetooth, UDP, TPC)
+    * NTRIP correction (RTK) can be enabled dependening on the device
+    * external sensor integration (radiation, gas, ...)
+
+* Synchronization
+    * Data synchronization via `QFieldCloud <https://qfield.cloud>`
+
+Implemented Standards
+--------------------------------------------------------------------------------
+
+* OGC standards compliant (WMS, WFS, ... )
+
+Details
+--------------------------------------------------------------------------------
+
+**Website:** @WEB_qfield@
+
+**Licence:** GNU General Public License (GPL) version 2
+
+**Software Version:** |version-qfield|
+
+**Supported Platforms:** Windows, Linux, Mac, Unix, iOS, Android
+
+**Community Support:** https://docs.qfield.org/get-started/support/
+
+**Commercial Support:** https://docs.qfield.org/get-started/support/
+
+
+@VMDK_qfield@
+@QUICKSTART_qfield@
+
+.. presentation-note
+    QField, is a very popular user-friendly mobile GIS client which allows you to visualize and collect data in combination with QGIS. It supports numerous vector, raster and database formats.
+