feat(dev): add vscode devcontainer config

.devcontainer/Dockerfile

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+# See here for image contents: https://github.com/microsoft/vscode-dev-containers/tree/v0.134.1/containers/typescript-node/.devcontainer/base.Dockerfile
+ARG VARIANT="14"
+FROM mcr.microsoft.com/vscode/devcontainers/typescript-node:0-${VARIANT}
+
+# [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 packages
+# RUN sudo -u node npm install -g <your-package-list -here>
+
+# [Optional] Persist bash history
+RUN SNIPPET="export PROMPT_COMMAND='history -a' && export HISTFILE=/commandhistory/.bash_history" \
+    && echo $SNIPPET >> "/root/.bashrc"

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/vscode-remote/devcontainer.json or this file's README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.134.1/containers/typescript-node
+{
+	"name": "Node.js & TypeScript",
+	"build": {
+		"dockerfile": "Dockerfile",
+		// Update 'VARIANT' to pick a Node version: 10, 12, 14
+		"args": {
+			"VARIANT": "12"
+		}
+	},
+	// 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": [
+		"dbaeumer.vscode-eslint",
+		"ms-vscode.vscode-typescript-tslint-plugin",
+		"jcbuisson.vue",
+		"sdras.vue-vscode-snippets",
+		"dariofuzinato.vue-peek",
+		"peakchen90.vue-beautify",
+		"gamunu.vscode-yarn"
+	],
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	"forwardPorts": [
+		3000
+	],
+	// Use 'postCreateCommand' to run commands after the container is created.
+	"postCreateCommand": "yarn install",
+	// Uncomment to connect as a non-root user. See https://aka.ms/vscode-remote/containers/non-root.
+	// "remoteUser": "node"
+	"mounts": [
+		"source=jellyfin-vue-history,target=/commandhistory,type=volume"
+	]
+}

.gitattributes

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+* text=auto eol=lf
+*.{cmd,[cC][mM][dD]} text eol=crlf
+*.{bat,[bB][aA][tT]} text eol=crlf