Merge pull request IQSS#10604 from plecor/5402-document-doi2pmh

Add info about DOI2PMH project in guide

Author: pdurbin

doc/sphinx-guides/source/admin/harvestclients.rst

@@ -47,3 +47,8 @@ What if a Run Fails?
 Each harvesting client run logs a separate file per run to the app server's default logging directory (``/usr/local/payara6/glassfish/domains/domain1/logs/`` unless you've changed it). Look for filenames in the format  ``harvest_TARGET_YYYY_MM_DD_timestamp.log`` to get a better idea of what's going wrong.
 
 Note that you'll want to run a minimum of Dataverse Software 4.6, optimally 4.18 or beyond, for the best OAI-PMH interoperability.
+
+Harvesting Non-OAI-PMH
+~~~~~~~~~~~~~~~~~~~~~~
+
+`DOI2PMH <https://github.com/IQSS/doi2pmh-server>`__ is a community-driven project intended to allow OAI-PMH harvesting from non-OAI-PMH sources.  

doc/sphinx-guides/source/api/apps.rst

@@ -133,6 +133,13 @@ https://github.com/libis/rdm-integration
 PHP
 ---
 
+DOI2PMH
+~~~~~~~
+
+The DOI2PMH server allow Dataverse instances to harvest DOI through OAI-PMH from otherwise unharvestable sources.
+
+https://github.com/IQSS/doi2pmh-server
+
 OJS
 ~~~