Fix:core:Rename README.md to README, since some external builds need a README.

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+[![Build Status](https://img.shields.io/circleci/project/github/navit-gps/navit/trunk.svg)](https://circleci.com/gh/navit-gps/navit)
+
+Navit on Android tablet:
+
+![navit on android](https://raw.githubusercontent.com/navit-gps/navit/trunk/contrib/images/androidtablet.png)
+
+Navit on Linux based Carputer:
+
+![navit-nuc-osd](https://github.com/pgrandin/navit-nuc-layout/raw/master/screenshot.png)
+
+<p>
+<a href="https://play.google.com/store/apps/details?id=org.navitproject.navit"><img src="http://switzerland.tasis.com/uploaded/images2/appstore_button_google.png" height="100"/></a>
+
+<a href="https://f-droid.org/repository/browse/?fdfilter=navit&fdid=org.navitproject.navit"><img src="https://upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Get_it_on_F-Droid.svg/200px-Get_it_on_F-Droid.svg.png" height="100"/></a>
+</p>
+
+NavIT
+=====
+
+Navit is a open source (GPL) car navigation system with routing engine.
+
+It's modular design is capable of using vector maps of various formats
+for routing and rendering of the displayed map. It's even possible to
+use multiple maps at a time.
+
+The GTK+ or SDL user interfaces are designed to work well with touch
+screen displays. Points of Interest of various formats are displayed
+on the map.
+
+The current vehicle position is either read from gpsd or directly from
+NMEA GPS sensors.
+
+The routing engine not only calculates an optimal route to your
+destination, but also generates directions and even speaks to you.
+
+Navit currently speaks over 70 languages!
+
+You can help translating via our web based translation page :
+ http://translations.launchpad.net/navit/trunk/+pots/navit
+
+
+For help or more information, please refer to the wiki :
+ http://wiki.navit-project.org
+
+If you don't know where to start, we recommend you to read the 
+Interactive Help : http://wiki.navit-project.org/index.php/Interactive_help
+
+
+Maps:
+=====
+
+The best navigation system is useless without maps. Those three maps
+are known to work:
+
+- OpenStreetMaps : display, routing, but street name search isn't complete
+ (see http://wiki.navit-project.org/index.php/OpenStreetMaps )
+
+- Grosser Reiseplaner and compliant maps : full support
+ (see http://wiki.navit-project.org/index.php/European_maps )
+
+- Garmin maps : display, routing, search is being worked on
+ (see http://wiki.navit-project.org/index.php/Garmin_maps )
+
+
+GPS Support:
+============
+
+Navit read the current vehicle position :
+- directly from a file
+- from gpsd (local or remote)
+- from udp server (friends tracking) (experimental)
+
+
+Routing algorithm
+=================
+
+NavIt uses a Dijkstra algorithm for routing. The routing starts at the
+destination by assigning a value to each point directly connected to
+destination point. The value represents the estimated time needed to
+pass this distance.
+
+Now the point with the lowest value is choosen using the Fibonacci
+heap and a value is assigned to connected points whos are
+unevaluated or whos current value ist greater than the new one.
+
+The search is repeated until the origin is found.
+
+Once the origin is reached, all that needs to be done is to follow the
+points with the lowest values to the destination.
+