add readme content

yangbo · Sep 8, 2015 · e5234dd · e5234dd
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diff --git a/README.md b/README.md
@@ -7,4 +7,8 @@ Py3r should have features like:
   - Decent slicing algorithm inspired by Simplify3D
   - Written in Python and C++ or Java (because I like java too)
 
+Some research:
 
+  - [Skeinforge](http://fabmetheus.crsndoo.com/wiki/index.php/Skeinforge) is a slicer wirtten in Python.
+  - [Sfact](http://reprap.org/wiki/Sfact) is an improved version.
+  - [Simple G-Code introduction](http://fabmetheus.crsndoo.com/wiki/index.php/G-Code)