Added README

README.md

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+# OSMParser
+
+OSMParser is a C++ library for reading and parsing OSM XML data.
+It uses tinyxml2 to read map data from a file and creates a C++ object to store all relevant data.
+
+## OSMParser does
+* extract all nodes, ways, relations from the XML file
+* tag each node, way, relation accordingly
+* make it easy to retrieve references (`nd`- and `member`-tags are stored as pointers)
+
+## OSMParser does not
+* render map data
+* assemble relations like multipolygons
+* query map data
+
+To see OSMParser in action check out my [related project](https://github.com/Lauchmelder23/MapViewer)