Add devcontainer default configuration

Author: robertoraggi

.devcontainer/devcontainer.json

@@ -0,0 +1,20 @@
+{
+  "image": "mcr.microsoft.com/devcontainers/universal:2",
+  "hostRequirements": {
+    "cpus": 4
+  },
+  "features": {},
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "llvm-vs-code-extensions.vscode-clangd",
+        "llvm-vs-code-extensions.lldb-dap",
+        "ms-vscode.cmake-tools",
+        "esbenp.prettier-vscode"
+      ],
+      "settings": {
+        "clangd.arguments": ["--completion-style=bundled"]
+      }
+    }
+  }
+}