added method for hpo api request

src/phenopacket_mapper/api_requests/hpo_api_request.py

@@ -0,0 +1,27 @@
+from typing import Union
+
+from phenopacket_mapper.data_standards import CodeSystem
+from phenopacket_mapper.api_requests import APIRequestSuperClass
+from phenopacket_mapper.api_requests import get as rest_get
+from phenopacket_mapper.data_standards import Coding, HPO
+
+
+class HPOAPIRequest(APIRequestSuperClass):
+    """A class to request data from the HPO API."""
+
+    api_base_url = "https://ontology.jax.org/api/hp/terms/HP:"
+
+    def __init__(self, hpo_code_system: CodeSystem = HPO) -> None:
+        self.hpo_code_system = hpo_code_system
+
+    def get(self, concept_id: Union[str, int]) -> Coding:
+        """Get details about a concept from the Orphanet API."""
+        json = rest_get(self.api_base_url + str(concept_id), json=True)
+
+        name = json['name']
+
+        return Coding(
+            system=self.hpo_code_system,
+            code=str(concept_id),
+            display=name
+        )