ab: add Readme

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README.md

+Implementation of the Dorfmann and Ogden 2004 used for Wharton's jelly mechanical characterisation
+===============================================================================
+
+This code aims to reproduce the non-linear viscous behaviour of soft biological tissues undergoing cyclic mechanical loads. 
+It is based on the work of:
+
+Dorfmann, A., and R. W. Ogden. 2004. *A Constitutive Model for the Mullins Effect with Permanent Set in Particle-Reinforced Rubber.* Int J Solids Struct 41 (7): 1855–78. https://doi.org/10.1016/j.ijsolstr.2003.11.014.
+
+It has been used to reproduce the mechanical response of Wharton's jelly (WJ) membranes under tensile loading. 
+The results are published in:
+
+Baldit, Adrien, Marie Dubus, Johan Sergheraert, Halima Kerdjoudj, Cedric Mauprivez, and Rachid Rahouadj. 2022. *Biomechanical Tensile Behavior of Human Wharton’s Jelly.* J. Mech. Behav. Biomed. Mater. 126:104981. https://doi.org/10.1016/j.jmbbm.2021.104981.
+
+This application leads to the following result:
+
+![img](.readme_images/Baldit_2021_JMBBM_Dorfmann_and_Ogden_2004.png)
+
+The dataset associated to the identification performed in Baldit et *al.*, 2022 is also available:
+
+Baldit, Adrien, Marie Dubus, Johan Sergheraert, Halima Kerdjoudj, Cédric Mauprivez, and Rachid Rahouadj. 2021. *Database on Biomechanical Tensile Behavior of Human Wharton’s Jelly.* Université de Lorraine. https://doi.org/10.12763/X7CQGU.