add recommend vs code settings

.vscode/extensions.json

@@ -0,0 +1,11 @@
+{
+  "recommendations": [
+    "ms-dotnettools.csharp",
+    "editorconfig.editorconfig",
+    "github.vscode-github-actions",
+    "ms-dotnettools.vscode-dotnet-runtime",
+    "ms-dotnettools.csdevkit",
+    "eamodio.gitlens"
+  ],
+  "unwantedRecommendations": []
+}

.vscode/settings.json

@@ -0,0 +1,9 @@
+{
+  "editor.insertSpaces": true,
+  "editor.tabSize": 4,
+  "files.encoding": "utf8",
+  "files.trimTrailingWhitespace": true,
+  "files.insertFinalNewline": true,
+  "editor.rulers": []
+  "dotnet.defaultSolution": "IntroSkipper.sln",
+}