Add how to cite

Author: mjohnson541

README.md

@@ -30,6 +30,12 @@ RMS has been used in many applications:
 * Handy plotting and other solution analysis tools.  
 * Easy to add new phases, domains, interfaces and other new features. 
 
+## How to cite
+Please include the following citations for ReactionMechanismSimulator.jl in general and for transitory sensitivities and the automatic mechanism analysis toolkit respectively. 
+
+- <div class="csl-entry">Johnson, M. S., Pang, H.-W., Payne, A. M., &#38; Green, W. H. (2023). <i>ReactionMechanismSimulator.jl: A Modern Approach to Chemical Kinetic Mechanism Simulation and Analysis</i>. https://doi.org/10.26434/CHEMRXIV-2023-TJ34T</div>
+- <div class="csl-entry">Johnson, M. S., McGill, C. J., &#38; Green, W. H. (2022). <i>Transitory Sensitivity in Automatic Chemical Kinetic Mechanism Analysis</i>. https://doi.org/10.26434/CHEMRXIV-2022-ZSFJC</div>
+
 ## Installation
 
 RMS can be installed with: