Add Continuum Mechanics notes

Change-Id: Ib7c7641fa9b2d7ee9e0551f32bc18746161d9f4f
diff --git a/quad8/continuummechanics/notes/notes6.tex b/quad8/continuummechanics/notes/notes6.tex
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+++ b/quad8/continuummechanics/notes/notes6.tex
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+% !TEX root = main.tex
+\chapter{Elastic waves}
+To do