move svg from inline to own file

Readme.md

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+# Ever wanted to have coils? 
+
+Who doesn't ? In this case we needed an on-chip octagonal coil design, but struggled
+with the idea of drawing them by hand.
+
+Which is why i created this SKILL script (actually LISP, but whatevs). 
+
+Once loaded into Cadence Virtuoso, it will give you access to an inductor PCell, which can (as extra candy) generate a groundshield for you as well.
+
+Just specify the number of turns, the outer diameter, conductor width and layers, and off you go. 
+
+Here are some examples of what this thing spits out. 
+
+Good Luck and Have fun!
+
+> Julian
+
+![](./img/inductor.png)