added Dockerfile and devcontainer with extensions and poetry

.devcontainer/Dockerfile

@@ -9,3 +9,6 @@ RUN apt update \
     && useradd -m -s /usr/bin/bash ${USER} \
     && echo "${USER} ALL=(ALL) NOPASSWD: ALL" >/etc/sudoers.d/${USER} \
     && chmod 0440 /etc/sudoers.d/${USER}
+
+# Install Poetry
+RUN pip install poetry

.devcontainer/devcontainer.json

@@ -4,7 +4,10 @@
   "remoteUser": "vscode",
   "customizations": {
     "vscode": {
-      "extensions": ["ms-python.python"]
+      "extensions": [
+        "ms-python.python",
+        "ms-azuretools.vscode-docker"
+      ]
     }
   }
 }