Merge pull request #18 from tordans/patch-2

Add Readme

Author: jochenklar

README.md

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+# [luftbilder.berlin.codefor.de](https://luftbilder.berlin.codefor.de/)
+
+A showcase of aerial imagery of different years for the city of Berlin.
+
+## Other projects
+
+* [maps.berlin.codefor.de](https://data.berlin.codefor.de) a general overview of map data [Github](https://github.com/codeforberlin/maps.berlin.codefor.de) 
+* [github.com/codeforberlin/mapproxy-config](https://github.com/codeforberlin/mapproxy-config) is a map proxy for some imagery layers by the City of Berlin
+* [github.com/codeforberlin/tilestache-config](https://github.com/codeforberlin/tilestache-config) is the config for serving areal imagery from file ([config](https://github.com/codeforberlin/tilestache-config/blob/master/config.json))
+
+## Data source
+
+The data is sourced from the FIS Broker, City of Berlin.
+Find the code at [github.com/codeforberlin/fis-broker](https://github.com/codeforberlin/fis-broker)