Update data-availability.md

docs/reference/data-availability.md

@@ -3,4 +3,18 @@
 - [uPheno 2 releases](https://github.com/obophenotype/upheno-dev/releases)
 - [uPheno 2 pattern library](https://github.com/obophenotype/upheno/tree/master/src/patterns/dosdp-patterns)
 - [uPheno 2 related mappings](https://data.monarchinitiative.org/mappings/latest/index.html)
-- 
+
+### Data assets
+
+- [Main ontology file (upheno.owl)](https://github.com/obophenotype/upheno-dev/releases/latest/download/upheno.owl)
+- SSSOM Mappings
+  - [Cross-species mappings](https://github.com/obophenotype/upheno-dev/blob/master/src/mappings/upheno-cross-species.sssom.tsv): https://github.com/obophenotype/upheno-dev/blob/master/src/mappings/upheno-cross-species.sssom.tsv
+  - [uPheno species-neutral mappings](https://github.com/obophenotype/upheno-dev/blob/master/src/mappings/upheno-species-independent.sssom.tsv): https://github.com/obophenotype/upheno-dev/blob/master/src/mappings/upheno-species-independent.sssom.tsv
+- [MGI and IMPC manually curated MP-HP mappings](https://github.com/mapping-commons/mh_mapping_initiative): https://github.com/mapping-commons/mh_mapping_initiative
+- Cross-species semantic similarity tables: https://data.monarchinitiative.org/semantic-similarity/latest/index.html
+
+
+### Other links
+
+- [Documentation](https://obophenotype.github.io/upheno/)
+- [Tutorial on phenotype data](https://oboacademy.github.io/obook/lesson/phenotype-data/)