Add vscode recommended extensions

.vscode/extensions.json

@@ -0,0 +1,9 @@
+{
+    "recommendations": [
+        "davidlday.languagetool-linter",
+        "yzhang.markdown-all-in-one",
+        "ms-vscode.cpptools",
+        "dtoplak.vscode-glsllint",
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}