added x_qhp_formula to quasi-harmonic meta data

meta_info/nomad_meta_info/quasi-harmonic-properties.nomadmetainfo.json

@@ -40,6 +40,18 @@
       ],
       "units": "K**-1"
     },
+    {
+      "description": "The chemical formula of the material for which the quasi-harmonic properties were calculated",
+      "dtypeStr": "f",
+      "name": "x_qhp_formula",
+      "shape": [
+        "number_of_thermodynamical_property_values"
+    ],
+      "superNames": [
+        "section_system"
+      ],
+      "units": "K**-1"
+    },
     {
       "description": "Holds the bulk modulus that is calculated from the helmolz free energy calculated from the quasi harmonic approximation",
       "dtypeStr": "f",