chore: import upstream snapshot with attribution

.devcontainer/Dockerfile

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+FROM python:3.9-slim-bullseye AS base
+
+RUN set -x
+
+RUN apt-get update \
+    && apt-get -y install curl \
+    && apt-get -y install net-tools \
+    && apt-get -y install procps \
+    && apt-get -y install build-essential \
+    && apt-get -y install docker.io
+
+# Install notebook depenency
+RUN pip install ipython ipykernel
+RUN ipython kernel install --user --name promptflow
+
+# FROM base AS promptflow
+COPY requirements.txt .
+RUN pip install -r requirements.txt
+
+RUN set +x
+
+CMD bash

.devcontainer/README.md

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+# Devcontainer for promptflow
+To facilitate your promptflow project development and empower you to work on LLM projects using promptflow more effectively, 
+we've configured the necessary environment for developing promptflow projects and utilizing flows through the dev container feature. 
+You can seamlessly initiate your promptflow project development and start leveraging flows by simply using the dev container feature via VS Code or Codespaces.
+
+## Use Github Codespaces
+Use codespaces to open promptflow repo, it will automatically build the dev containers environment and open promptflow with dev containers. You can just click: [![Open in GitHub Codespaces](https://github.com/codespaces/badge.svg)](https://codespaces.new/microsoft/promptflow?quickstart=1)
+
+## Use local devcontainer
+Use vscode to open promptflow repo, and install vscode extension: Dev Containers and then open promptflow with dev containers. 
+![devcontainer](./devcontainers.png)  
+**About dev containers please refer to: [dev containers](https://code.visualstudio.com/docs/devcontainers/containers)**
+

.devcontainer/devcontainer.json

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+{
+  "name": "Promptflow-Python39",
+  // "context" is the path that the Codespaces docker build command should be run from, relative to devcontainer.json
+  "context": ".",
+  "dockerFile": "Dockerfile",
+  "runArgs": ["-v", "/var/run/docker.sock:/var/run/docker.sock"],
+  "remoteEnv": {
+    "HOST_PROJECT_PATH": "${localWorkspaceFolder}"
+  },
+  "customizations": {
+    "codespaces": {
+      "openFiles": ["README.md", "examples/README.md"]
+    },
+    "vscode": {
+      // Set *default* container specific settings.json values on container create.
+      "settings": {
+        "terminal.integrated.shell.linux": "/bin/bash"
+      },
+      // Add the IDs of extensions you want installed when the container is created.
+      "extensions": [
+        "ms-python.python",
+        "ms-toolsai.vscode-ai",
+        "ms-toolsai.jupyter",
+        "redhat.vscode-yaml",
+        "prompt-flow.prompt-flow"
+      ]
+    }
+  },
+  "features": { 
+	"ghcr.io/devcontainers/features/azure-cli:1": {}
+  }
+}

.devcontainer/requirements.txt

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+promptflow[azure]>=1.9.0
+promptflow-tools