add devcontainer config

Author: pomdtr

.devcontainer/devcontainer.json

@@ -0,0 +1,7 @@
+{
+	"image": "mcr.microsoft.com/vscode/devcontainers/base:ubuntu",
+	"features": {
+		"ghcr.io/devcontainers/features/go:1": {},
+		"ghcr.io/devcontainers-community/features/deno:1": {}
+	}
+}