Update README

README.md

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+# Random computer graphics algorithms visualized with the Diagrams library
+
+## Building
+
+cabal build (you need cabal)
+
+## Running
+
+```cabal run Gtk -- file.obj```
+or
+```cabal run Gif -- -w 600 -h 600 -o out.gif```
+
+### Build Status
+[![Build Status](https://travis-ci.org/hasufell/CG2.png)](https://travis-ci.org/hasufell/CG2)