added metadata for espresso stress

meta_info/nomad_meta_info/elastic.nomadmetainfo.json

@@ -76,12 +76,19 @@
       "superNames": [
         "x_elastic_section_strain_diagrams" ]
     }, {
-      "description": "Kind of strain diagram. Possible values are: energy; cross-validation (cross-validation error); d2E (second derivative of the energy wrt the strain)",
+      "description": "Kind of strain diagram. Possible values are: energy; Lagrangian-stress; Physical-stress; cross-validation (cross-validation error); d2E (second derivative of the energy with respect to the strain); dtn (first derivative of the stress with respect to the strain)",
       "dtypeStr": "C",
       "name": "x_elastic_strain_diagram_type",
       "shape": [],
       "superNames": [
         "x_elastic_section_strain_diagrams" ]
+    }, {
+      "description": "Voigt component of the deformation for the stress approach",
+      "dtypeStr": "i",
+      "name": "x_elastic_strain_diagram_stress_Voigt_component",
+      "shape": [],
+      "superNames": [
+        "x_elastic_section_strain_diagrams" ]
     }, {
       "description": "Order of the polinomial fit",
       "dtypeStr": "i",