Material: Added mk2's material cards

src/Mod/Material/StandardMaterial/C15.FCMat

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+; C15 - 1.0401 - DIN 17210
+; (c) 2014 M. Münch - GNU Lesser General Public License (LGPL)
+; information about the content of this card can be found here:
+; http://www.freecadweb.org/wiki/index.php?title=Material
+
+[General]
+Vendor=
+Name=German norm only!
+NameDE=C15
+MaterialNumber=1.0401
+Norm=DIN 17210
+KindOfMaterial=Case-hardened steel
+KindOfMaterialDE=Einsatzstahl
+SpecificPrice=
+Father=Metal
+ProductURL=
+; Specific Weight - kg/m³
+SpecificWeight=7800
+Description=
+DescriptionDE=kleine Teile härtbar; Bolzen, Büchsen, Gelenke, Spindeln
+
+[Mechanical]
+;Ultimate Tensile Strength - Rm - N/mm²
+UltimateTensileStrength=750
+; Yield Strength - Re - N/mm²
+YieldStrength=430
+CompressiveStrength=
+; Youngs Modulus - E-Modul - N/mm²
+YoungsModulus=210000
+; ModulusOfShare - G-Modul - N/mm²
+ModulusOfShare=81000
+Elasticity=
+FractureToughness=
+; Ultimate Strain - Bruchdehnung - %
+UltimateStrain=14
+; Thermal Expansion Coefficient - Ausdehnungskoeffizient - 1/K
+ThermalExpansionCoefficient=1,10E-05
+
+[FEM]
+; Poisson Ratio - Querkontraktionszahl
+PoissonRatio=0.3