Add dev container settings

.devcontainer/devcontainer.json

+{
+    "image":"mcr.microsoft.com/devcontainers/universal:2",
+    "features": {
+        "ghcr.io/devcontainers/features/python:1": {
+            "version": "3.9"
+        }
+    }
+}
\ No newline at end of file