Added devcontainer

.devcontainer/Dockerfile

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+# See here for image contents: https://github.com/microsoft/vscode-dev-containers/tree/v0.140.1/containers/javascript-node/.devcontainer/base.Dockerfile
+
+# Based on Node.js 14
+FROM mcr.microsoft.com/vscode/devcontainers/javascript-node:0-14
+
+# [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>
+
+# [Optional] Uncomment if you want to install an additional version of node using nvm
+# ARG EXTRA_NODE_VERSION=10
+# RUN su node -c "source /usr/local/share/nvm/nvm.sh && nvm install ${EXTRA_NODE_VERSION}"
+
+# [Optional] Uncomment if you want to install more global node modules
+# RUN sudo -u node npm install -g <your-package-list-here>

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.140.1/containers/javascript-node
+{
+    "name": "svelte-spa-router",
+
+    "dockerComposeFile": "docker-compose.yaml",
+    "service": "development",
+    "workspaceFolder": "/workspace",
+
+	// Set *default* container specific settings.json values on container create.
+	"settings": { 
+		"terminal.integrated.shell.linux": "/usr/bin/zsh"
+	},
+
+	// Add the IDs of extensions you want installed when the container is created.
+	"extensions": [
+        "bierner.markdown-preview-github-styles",
+        "davidanson.vscode-markdownlint",
+        "dbaeumer.vscode-eslint",
+        "eg2.vscode-npm-script",
+        "svelte.svelte-vscode",
+	],
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	"forwardPorts": [
+        5000
+    ],
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	"postCreateCommand": "npm install",
+
+	// Connect as a non-root user
+	"remoteUser": "node"
+}

.devcontainer/docker-compose.yaml

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+version: '3'
+
+services:
+  development:
+    build: 
+      context: .
+      dockerfile: Dockerfile
+    volumes:
+      # Update this to wherever you want VS Code to mount the folder of your project
+      - ..:/workspace:cached
+    # Overrides default command so things don't shut down after the process ends.
+    command: sleep infinity 
+    # Use a non-root user for all processes.
+    user: node
+    environment:
+      - 'SELENIUM_HOST=selenium-chrome'
+      - 'SELENIUM_PORT=4444'
+      - 'LAUNCH_URL=http://nginx'
+  nginx:
+    image: nginx:1.19
+    container_name: nginx
+    volumes:
+      - ../test/app/dist:/usr/share/nginx/html:ro
+    ports:
+        - 8080:80
+  selenium-chrome:
+    image: selenium/standalone-chrome:85.0
+    container_name: selenium-chrome
+    shm_size: '2gb'