Added pyvnt implementation of cavity case and modified writer functio…

…n according to needs

.vscode/settings.json

@@ -0,0 +1,16 @@
+{
+    "files.associations": {
+        "dictionaryFile.C": "cpp",
+        "*Dict": "OpenFOAM",
+        "*Properties": "OpenFOAM",
+        "fvSchemes": "OpenFOAM",
+        "fvSolution": "OpenFOAM",
+        "**/constant/g": "OpenFOAM",
+        "**/0/*": "OpenFOAM"
+    },
+    "python.testing.pytestArgs": [
+        "tests"
+    ],
+    "python.testing.unittestEnabled": false,
+    "python.testing.pytestEnabled": true
+}