Create devcontainer.json (#81)

.devcontainer/devcontainer.json

+{
+  "image": "mcr.microsoft.com/devcontainers/universal:2",
+  "features": {
+    "ghcr.io/devcontainers/features/git:1": {},
+    "ghcr.io/devcontainers/features/github-cli:1": {},
+    "ghcr.io/devcontainers/features/python:1": {
+      "version": "3.11"
+    }
+  }
+}