add info in readme

README.md

@@ -1,20 +1,22 @@
 ---
 license: cc-by-4.0
 configs:
-- config_name: 3d
+- config_name: 3D
   data_file:
   - split: train
     path: ""
-- config_name: 2d
+- config_name: 2D
   data_file:
   - split: train
     path: ""
-- config_name: 1d
+- config_name: 1D
   data_file:
   - split: train
     path: ""
 ---
 
+This HF dataset repository is the mirror and preprocessed data of [Alexandria](https://alexandria.icams.rub.de/) database compiled by the group of Prof. Miguel A. L. Marques at Ruhr University Bochum.
+
 # License
 
-Alexandria is available for use under the terms of the Creative Commons Attribution 4.0 License. Under this license you are free to share and adapt the data, but you must give appropriate credit to alexandria, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
+[Alexandria](https://alexandria.icams.rub.de/) is available for use under the terms of the [Creative Commons Attribution 4.0 License](https://creativecommons.org/licenses/by/4.0/). Under this license you are free to share and adapt the data, but you must give appropriate credit to alexandria, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.