Add citation

README.md

@@ -33,3 +33,20 @@ Optional arguments:
      -s1 S1       reference pdb file of channel 1
      -f1 F1       trajectory fitted to a reference channel 1
      -P {nh,16K}  TMEM16 isoform
+
+
+# citation
+If you make use of this data, please cite the corresponding paper.
+```
+@Article{Kostritskii2021,
+  author          = {Kostritskii, Andrei Y. and Machtens, Jan-Philipp},
+  journal         = {Nature Communications},
+  title           = {Molecular mechanisms of ion conduction and ion selectivity in TMEM16 lipid scramblases.},
+  year            = {2021},
+  month           = may, 
+  pages           = {2826},
+  volume          = {12},
+  issue           = {1},
+  doi             = {10.1038/s41467-021-22724-w},
+  url             = {https://doi.org/10.1038/s41467-021-22724-w}  
+}