screenshots and github friendly readme

README.md

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+flight-sim is a simple space flight simulator written in Lisp (tested only in SBCL) with cl-opengl and sdl.
+Right now it's mostly still in tech demo stage
+
+So far the controls are simple. 
+
+A - Forward acceleration
+
+Requires: 
+ASDF
+cl-opengl
+cl-glu
+lispbuilder-sdl
+
+To try:
+$ sh run.sh
+
+![The ship sitting in space with a field of diamond](github.com/dballard/flight-sim/img/screenshot1.png)
+![The ship firing it's main thruster](github.com/dballard/flight-sim/img/screenshot2.png)
+
+Youtube video:
+<https://www.youtube.com/watch?v=8Y6zutbYWvg>