Continous Mechanics: add HW1

Change-Id: Iacb207a35af24127402cb2afa08faa61a18c9ef5
diff --git a/quad8/continuummechanics/homework/hw1/references.bib b/quad8/continuummechanics/homework/hw1/references.bib
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+@booklet{geo,
+  author={Facultat de Matemàtiques i Estadística (UPC)},
+  title={Apunts Geometría afí i euclidiana},
+  url={https://drive.google.com/file/d/1V1TodeUpnjbe-JKKufW_Qe37EIHXZAUN/view}
+}
+
+@booklet{multi,
+  author={Òscar Benedito, Ernesto Lanchares, Miquel Ortega},
+  title={Álgebra Multilineal y Geometría Proyectiva},
+  organization={ApuntsFME},
+  pages={11},
+  url={https://apuntsfme.gitlab.io/pdfs/segon/algebra_multilineal_y_geometria.pdf},
+  year={2018}
+}
+
+@online{mathe,
+  title={Cross product: matrix transformation identity},
+  url={https://math.stackexchange.com/questions/859836/cross-product-matrix-transformation-identity}
+}