Merge pull request #552 from monarch-initiative/restore-phenio-doc

Restore phenio doc

docs/Sources/phenio.md

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+# Phenio
+
+An ontology for accessing and comparing knowledge concerning phenotypes across species and genetic backgrounds.
+
+For more information, see:  
+
+- [NCATS Translater Phenio Overview](https://github.com/NCATSTranslator/Translator-All/wiki/phenio)
+- [KGHub Phenio](https://github.com/Knowledge-Graph-Hub/kg-phenio)  
+- [Monarch Phenio](https://github.com/monarch-initiative/phenio)
+- [Documentation](https://monarch-initiative.github.io/phenio/)
+
+## Source Code
+
+https://github.com/monarch-initiative/phenio