added readme

readme.md

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+# Procedurally generate planets
+
+
+The curent version works with a modiefied midpoint-displacement method on a sphere.
+It can generate different levels of detail on demand.
+
+![lod0](screenshots/lod0.png)
+![lod1](screenshots/lod1.png)
+![lod2](screenshots/lod2.png)
+![lod3](screenshots/lod3.png)
+
+I think the generation could be twekead to only generate a small portion in a heigh
+level of detail and keep the rest low level, so a player sees everythig in high detail,
+while the computer only has to compute a fraction in hd.