add prto ontology namespace

Author: Said Fathalla

ptro/.htaccess

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+# Contact person name: Olga Giraldo
+# Contact person email: olga.giraldo@dkfz-heidelberg.de
+# Artefact: PTRO  
+# Artefact Name: Preclinical Trials in Radiation Oncology
+# Resource location: https://raw.githubusercontent.com/DKFZ-E220/PTRO/main/PTRO.owl
+
+Options +FollowSymLinks
+Options -MultiViews
+RewriteEngine on
+
+# Directive to ensure *.rdf files served as appropriate content type
+AddType application/rdf+xml .owl
+
+
+# Rewrite rule to serve RDF/XML content
+RewriteCond %{HTTP_ACCEPT} ^.*application/rdf\+xml.*  [OR]
+RewriteCond %{HTTP_ACCEPT} ^.*application/xml.* [OR]
+RewriteCond %{HTTP_ACCEPT} ^.*text/xml.*
+RewriteRule ^$ https://raw.githubusercontent.com/DKFZ-E220/PTRO/main/PTRO.owl [R=303,NE,L]
+
+# Default response
+RewriteRule ^$ https://raw.githubusercontent.com/DKFZ-E220/PTRO/main/PTRO.owl [R=303,NE,L]

ptro/README.md

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+### Artifact name
+PTRO Ontology – Preclinical Trials in Radiation Oncology.
+
+### Overview
+The PTRO ontology is a domain-specific ontology designed to standardize, structure, and semantically represent preclinical trial data in radiation oncology. It facilitates the integration and querying information organized according the [SEND](https://www.cdisc.org/standards/foundational/send) standard. The ontology is currently being validated using a [virtual knowledge graph approach](https://ontop-vkg.org/), enabling access to datasets available on the [RadPlanBio](https://helmholtz.software/software/radplanbio) platform.
+
+### Reach out
+For background information, please refer to our [paper](https://ceur-ws.org/Vol-3939/short2.pdf)
+GitHub repository: https://github.com/DKFZ-E220/PTRO