Add webpack sample (#337)

* Add webpack sample

* Add note about recommended npm version

samples/webpack/README.md

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+# Typed Rest Client Webpack Sample
+
+## Description
+
+This is a basic example of using Typed Rest Client in a browser via `webpack`.
+
+It uses `webpack 5` for build and run browser-ready bundle.
+
+## Requirements
+
+It requires `nodejs` >= `10.x` to run.
+
+It is recommended to use `npm 8.x` to minimize friction between package-lock formatting.
+
+## Usage
+
+To run this sample, enter following commands at the command line:
+
+```sh
+npm i
+npm run start
+```

samples/webpack/babel.config.json

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+{
+ "presets": [
+ "@babel/preset-env"
+ ]
+}