diff --git a/api/.devcontainer/Dockerfile b/api/.devcontainer/Dockerfile
new file mode 100644
index 0000000..c123945
--- /dev/null
+++ b/api/.devcontainer/Dockerfile
@@ -0,0 +1,31 @@
+# See here for image contents: https://github.com/microsoft/vscode-dev-containers/tree/v0.245.2/containers/python-3/.devcontainer/base.Dockerfile
+
+# [Choice] Python version (use -bullseye variants on local arm64/Apple Silicon): 3, 3.10, 3.9, 3.8, 3.7, 3.6, 3-bullseye, 3.10-bullseye, 3.9-bullseye, 3.8-bullseye, 3.7-bullseye, 3.6-bullseye, 3-buster, 3.10-buster, 3.9-buster, 3.8-buster, 3.7-buster, 3.6-buster
+ARG VARIANT="3.10-bullseye"
+FROM mcr.microsoft.com/vscode/devcontainers/python:0-${VARIANT}
+
+# [Choice] Node.js version: none, lts/*, 16, 14, 12, 10
+ARG NODE_VERSION="none"
+RUN if [ "${NODE_VERSION}" != "none" ]; then su vscode -c "umask 0002 && . /usr/local/share/nvm/nvm.sh && nvm install ${NODE_VERSION} 2>&1"; fi
+
+# [Optional] If your pip requirements rarely change, uncomment this section to add them to the image.
+# COPY requirements.txt /tmp/pip-tmp/
+# RUN pip3 --disable-pip-version-check --no-cache-dir install -r /tmp/pip-tmp/requirements.txt \
+#    && rm -rf /tmp/pip-tmp
+
+# [Optional] Uncomment this section to install additional OS packages.
+# RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+#     && apt-get -y install --no-install-recommends <your-package-list-here>
+
+
+RUN set -ex; \
+    \
+    export DEBIAN_FRONTEND=noninteractive; \
+    apt-get update; apt-get -y install --no-install-recommends \
+    git-flow \
+    ; rm -rf /var/lib/apt/lists/*;
+
+# [Optional] Uncomment this line to install global node packages.
+# RUN su vscode -c "source /usr/local/share/nvm/nvm.sh && npm install -g <your-package-here>" 2>&1
+
+RUN su vscode -c "curl -sSL https://install.python-poetry.org | python3 -" 2>&1
diff --git a/api/.devcontainer/devcontainer.json b/api/.devcontainer/devcontainer.json
new file mode 100644
index 0000000..ea0bbda
--- /dev/null
+++ b/api/.devcontainer/devcontainer.json
@@ -0,0 +1,51 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.245.2/containers/python-3
+{
+	"name": "Python 3",
+	"build": {
+		"dockerfile": "Dockerfile",
+		"context": "..",
+		"args": {
+			// Update 'VARIANT' to pick a Python version: 3, 3.10, 3.9, 3.8, 3.7, 3.6
+			// Append -bullseye or -buster to pin to an OS version.
+			// Use -bullseye variants on local on arm64/Apple Silicon.
+			"VARIANT": "3.10",
+			// Options
+			"NODE_VERSION": "none"
+		}
+	},
+	// Configure tool-specific properties.
+	"customizations": {
+		// Configure properties specific to VS Code.
+		"vscode": {
+			// Set *default* container specific settings.json values on container create.
+			"settings": {
+				"python.defaultInterpreterPath": "/usr/local/bin/python",
+				"python.linting.enabled": true,
+				"python.linting.pylintEnabled": true,
+				"python.formatting.autopep8Path": "/usr/local/py-utils/bin/autopep8",
+				"python.formatting.blackPath": "/usr/local/py-utils/bin/black",
+				"python.formatting.yapfPath": "/usr/local/py-utils/bin/yapf",
+				"python.linting.banditPath": "/usr/local/py-utils/bin/bandit",
+				"python.linting.flake8Path": "/usr/local/py-utils/bin/flake8",
+				"python.linting.mypyPath": "/usr/local/py-utils/bin/mypy",
+				"python.linting.pycodestylePath": "/usr/local/py-utils/bin/pycodestyle",
+				"python.linting.pydocstylePath": "/usr/local/py-utils/bin/pydocstyle",
+				"python.linting.pylintPath": "/usr/local/py-utils/bin/pylint"
+			},
+			// Add the IDs of extensions you want installed when the container is created.
+			"extensions": [
+				"ms-python.python",
+				"ms-python.vscode-pylance",
+				"be5invis.toml"
+			]
+		}
+	},
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "pip3 install --user -r requirements.txt",
+	"postStartCommand": "poetry install",
+	// Comment out to connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+	"remoteUser": "vscode"
+}
\ No newline at end of file
diff --git a/.gitignore b/api/.gitignore
similarity index 100%
rename from .gitignore
rename to api/.gitignore
diff --git a/api/.vscode/settings.json b/api/.vscode/settings.json
new file mode 100644
index 0000000..3edcec7
--- /dev/null
+++ b/api/.vscode/settings.json
@@ -0,0 +1,17 @@
+{
+    "python.testing.pytestArgs": [
+      "tests"
+    ],
+    "python.testing.unittestEnabled": false,
+    "python.testing.pytestEnabled": true,
+    "python.linting.enabled": true,
+    "python.linting.pylintEnabled": false,
+    "python.linting.flake8Enabled": true,
+    "python.languageServer": "Pylance",
+    "editor.formatOnSave": true,
+    "editor.codeActionsOnSave": {
+      "source.organizeImports": true
+    },
+    "git.closeDiffOnOperation": true,
+    "python.analysis.typeCheckingMode": "basic"
+  }
\ No newline at end of file
diff --git a/api/poetry.lock b/api/poetry.lock
new file mode 100644
index 0000000..c93bb8f
--- /dev/null
+++ b/api/poetry.lock
@@ -0,0 +1,8 @@
+package = []
+
+[metadata]
+lock-version = "1.1"
+python-versions = "^3.9"
+content-hash = "ce2aa767160f871dd3652615ba0a0dceb7733d62eb8cb4665b87f30a562e3adf"
+
+[metadata.files]
diff --git a/api/pyproject.toml b/api/pyproject.toml
new file mode 100644
index 0000000..123a529
--- /dev/null
+++ b/api/pyproject.toml
@@ -0,0 +1,18 @@
+[tool.poetry]
+name = "advent22"
+version = "0.1.0"
+description = ""
+authors = [
+    "Jörn-Michael Miehe <jmm@yavook.de>",
+    "Penner42 <wont@say.it>"
+]
+license = "MIT"
+
+[tool.poetry.dependencies]
+python = "^3.9"
+
+[tool.poetry.dev-dependencies]
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"