Update README.md

README.md

@@ -5,5 +5,8 @@ The __DIALECT__(**DIA**batic **L**ocally **E**xcited and **C**harge-**T**ransfer
 # Documentation
 A short guide, which explains the installation and use of our program is available [here](https://github.com/dialect-rs/manual).  
 
+# Citation
+Richard Einsele, Joscha Hoche, and Roland Mitrić, Long-range corrected fragment molecular orbital density functional tight-binding method for excited states in large molecular systems, *J. Chem. Phys.*, __2023__, 158, 044121, https://doi.org/10.1063/5.0136844
+
 # License
 __DIALECT__ is released under the GNU Lesser General Public License. For more information, see the included [LICENSE](https://github.com/dialect-rs/DIALECT-rs/blob/main/LICENSE) file.