Update README.md with instructions for customizing EspoCRM entities and layouts; remove obsolete testArray from entity definition.

custom/Espo/Custom/Resources/metadata/entityDefs/CVmhErstgespraech.json

@@ -371,14 +371,6 @@
             "default": null,
             "buttonLabel": "Erstberatung versenden",
             "readOnly": true
-        },
-        "testArray": {
-            "type": "array",
-            "storeArrayValues": true,
-            "noEmptyString": true,
-            "default": [],
-            "itemsEditable": true,
-            "isCustom": true
         }
     },
     "links": {