Introduce devcontainer

.devcontainer/devcontainer.json

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+{
+	"name": "freqtrade Develop",
+
+	// Update the 'dockerComposeFile' list if you have more compose files or use different names.
+	// The .devcontainer/docker-compose.yml file contains any overrides you need/want to make.
+	"dockerComposeFile": [
+		"docker-compose.yml"
+		// "docker-compose.vscode.yml"
+	],
+
+	"service": "freqtrade_develop",
+
+	// The optional 'workspaceFolder' property is the path VS Code should open by default when
+	// connected. This is typically a file mount in .devcontainer/docker-compose.yml
+	"workspaceFolder": "/freqtrade/",
+
+	"settings": {
+		"terminal.integrated.shell.linux": null
+	},
+
+	// Add the IDs of extensions you want installed when the container is created.
+	"extensions": [],
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+
+	// Uncomment the next line if you want start specific services in your Docker Compose config.
+	// "runServices": [],
+
+	// Uncomment the next line if you want to keep your containers running after VS Code shuts down.
+	// "shutdownAction": "none",
+
+	// Uncomment the next line to run commands after the container is created - for example installing curl.
+	// "postCreateCommand": "sudo apt-get update && apt-get install -y git",
+
+	// Uncomment to connect as a non-root user if you've added one. See https://aka.ms/vscode-remote/containers/non-root.
+	"remoteUser": "ftuser"
+}

.devcontainer/docker-compose.yml

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+---
+version: '3'
+services:
+  freqtrade_develop:
+    build:
+      context: ..
+      dockerfile: "Dockerfile.develop"
+    volumes:
+      - ..:/freqtrade:cached
+    command: /bin/sh -c "while sleep 1000; do :; done"