added paper-directory link

Author: stschiff

_sidebar.md

@@ -25,6 +25,7 @@
 	* [Developer notes](dev_notes.md)
 * **<i class="fas fa-download" aria-hidden="true"></i>&nbsp; The Poseidon Archives**
 	* [Public archives](archive_overview.md)
+	* [Paper Directory](paper-directory.md)
 	* [<i class="fas fa-globe-europe" aria-hidden="true"></i> Archive explorer](https://server.poseidon-adna.org)
 	* [Web API](web_api.md)
 	* [Submission guide](archive_submission_guide.md)

archive_overview.md

@@ -42,4 +42,4 @@ The Poseidon Minotaur Archive mirrors the PCA in that it features publication-wi
 
 <i class="fas fa-arrow-right"></i> [<i class="fab fa-github" aria-hidden="true"></i> GitHub](https://github.com/poseidon-framework/aadr-archive) | [<i class="fas fa-globe-europe" aria-hidden="true"></i> Explorer](https://server.poseidon-adna.org/explorer/aadr-archive)
 
-The Poseidon AADR Archive is the conceptionally most simple archive. It features **"poseidonized" versions of releases of the [Allen Ancient DNA Resource (AADR)](https://reich.hms.harvard.edu/allen-ancient-dna-resource-aadr-downloadable-genotypes-present-day-and-ancient-dna-data)**. The code and decisions for the cleaning and packaging process are documented [here](https://github.com/poseidon-framework/aadr2poseidon). Due to file size limitations of GitHub's LFS system each AADR dataset is split into smaller sub-packages by data type and geographic origin.
+The Poseidon AADR Archive is the conceptionally most simple archive. It features **"poseidonized" versions of releases of the [Allen Ancient DNA Resource (AADR)](https://reich.hms.harvard.edu/allen-ancient-dna-resource-aadr-downloadable-genotypes-present-day-and-ancient-dna-data)**. The code and decisions for the cleaning and packaging process are documented [here](https://github.com/poseidon-framework/aadr2poseidon). Due to file size limitations of GitHub's LFS system each AADR dataset is split into smaller sub-packages by data type and geographic origin.

paper-directory.md

@@ -0,0 +1,3 @@
+# The Poseidon Paper Directory
+
+We maintain a list of all papers that we got aware of, and curate a table which of these papers are available in which archive. You can access this directory [here](https://www.poseidon-adna.org/paper-directory/).