Update README.md

added PCL mappings, as hinted by Evan (plus other updates)

README.md

@@ -2,12 +2,31 @@
 
 A project for interactions with PubChem
 
+## PubChemLite
+* ***Download the latest PubChemLite at DOI:[10.5281/zenodo.5995885](https://doi.org/10.5281/zenodo.5995885)*** 
+(updating monthly)
 * [PubChemLite Build Process Documentation](pubchemlite/README.org)
-* [Transformations Documentation](annotations/tps/README.md)
 * [Zenodo Submission Subsystem (Depositor)](pubchemlite/depositor/README.md)
 
+PubChemLite Versions:
+
+ Version  | Description    |DOI/URL
+----------|----------------|--------
+ *Latest* | PCL-Exposomics (latest) | DOI:[10.5281/zenodo.5995885](https://doi.org/10.5281/zenodo.5995885)
+01/01/2021| PCL-Exposomics | DOI:[10.5281/zenodo.4432124](https://doi.org/10.5281/zenodo.4432124)
+01/01/2021| PCL-Exposomics + CCS | DOI:[10.5281/zenodo.4432124](https://doi.org/10.5281/zenodo.4432124)
+31/10/2020| PCL-Exposomics | DOI:[10.5281/zenodo.4183801](https://doi.org/10.5281/zenodo.4183801)
+14/01/2020| PCL-tier0&tier1 | DOI:[10.5281/zenodo.3611238](https://doi.org/10.5281/zenodo.3611238)
+
+
+## PubChem/NORMAN-SLE Integration
+* [Transformations Documentation](annotations/tps/README.md)
+* [Deposition](deposition) (internal use only)
+* [Annotation Efforts](annotations) (internal use only)
+
+## License
 Content in this repository is shared under these license conditions:
 * Code: Artistic-2.0
-* Data: [Creative Commons Attribution 4.0 International](http://creativecommons.org/licenses/by/4.0/legalcode)
+* Data: CC-BY 4.0 [(Creative Commons Attribution 4.0 International)](http://creativecommons.org/licenses/by/4.0/legalcode)
 
-Copyright (c) 2017-2021 University of Luxembourg
+Copyright (c) 2017-2022 University of Luxembourg