Adds devcontainer

.devcontainer/configuration.yaml

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+default_config:
+lovelace:
+  mode: yaml
+demo:

.devcontainer/devcontainer.json

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+// See https://aka.ms/vscode-remote/devcontainer.json for format details.
+{
+  "name": "Boilerplate Card Development",
+  "image": "ludeeus/devcontainer:monster",
+  "context": "..",
+  "appPort": ["5000:5000", "9123:8123"],
+  "postCreateCommand": "npm install",
+  "runArgs": [
+    "-v",
+    "${env:HOME}${env:USERPROFILE}/.ssh:/tmp/.ssh" // This is added so you can push from inside the container
+  ],
+  "extensions": [
+    "github.vscode-pull-request-github",
+    "tabnine.tabnine-vscode",
+    "dbaeumer.vscode-eslint",
+    "ms-vscode.vscode-typescript-tslint-plugin",
+    "esbenp.prettier-vscode",
+    "bierner.lit-html",
+    "runem.lit-plugin",
+    "ms-python.python"
+  ],
+  "settings": {
+    "files.eol": "\n",
+    "editor.tabSize": 4,
+    "terminal.integrated.shell.linux": "/bin/bash",
+    "editor.formatOnPaste": false,
+    "editor.formatOnSave": true,
+    "editor.formatOnType": true,
+    "files.trimTrailingWhitespace": true
+  }
+}

.devcontainer/ui-lovelace.yaml

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+resources:
+  - url: http://127.0.0.1:5000/boilerplate-card.js
+    type: module
+views:
+  - cards:
+      - type: "custom:boilerplate-card"
+        name: Boilerplace card development