add VSCode dev container support and documenation

Author: akutruff

.devcontainer/devcontainer.json

@@ -0,0 +1,22 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/typescript-node
+{
+	"name": "Node.js & TypeScript",
+	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+	"image": "mcr.microsoft.com/devcontainers/typescript-node:1-20-bullseye",
+
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	// "features": {},
+
+	// 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": "yarn install"
+
+	// Configure tool-specific properties.
+	// "customizations": {},
+
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "root"
+}

CONTRIBUTING.md

@@ -31,6 +31,17 @@ The following steps will get you setup to contribute changes to this repo:
 
 4. Start playing with the code! You can do some simple experimentation in [`playground.ts`](playground.ts) (see `yarn play` below) or start implementing a feature right away.
 
+## Alternative: VSCode Dev Container setup
+
+For an officially supported isolated dev environment that automatically installs dependencies for you:
+
+1. `F1` in VSCode and start typing `Dev Containers: Clone Repository in Named Container Volume` to run the command.
+2. For the repo, paste `[email protected]:{your_username}/zod.git` if you're using ssh.
+3. Click `Create a new volume...` and name it `zod` and the folder name as `zod`.
+
+Note: if you can't see `Dev Containers` in the `F1` menu, follow [this guide](https://code.visualstudio.com/docs/devcontainers/tutorial) to install the needed extension.
+In the OSS version of VSCode the extension may be not available.
+
 ### Commands
 
 **`yarn build`**