Add .vscode folder and settings

Author: albertospelta

.vscode/extensions.json

@@ -0,0 +1,6 @@
+{
+  "recommendations": [
+    "analysis-services.tmdl",
+    "davidanson.vscode-markdownlint"
+  ]
+}

.vscode/settings.json

@@ -0,0 +1,8 @@
+{
+  "editor.insertSpaces": true,
+  "editor.tabSize": 4,
+  "editor.detectIndentation": false,
+  "files.associations": {
+    "*.daxlib": "json"
+  }
+}