add super basic installation docs

storybook/getting-started.md

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+# Getting Started
+
+First, install the package from NPM (note for monthly call viewers: the package isn't published yet.)
+
+```sh
+npm install @uswds/web-components
+```
+
+Once you have the package installed, you can use the components in your project. If you import the entire package, all of the components will be available as exports.
+
+```html
+<script type="module">
+    import '@uswds/web-components';
+</script>
+
+<usa-banner></usa-banner>
+<usa-link href="https://designsystem.digital.gov">It's dangerous to go alone. Here, take this.</usa-link>
+```
+
+However, if you import components individually, your build tool may be able to help you ship less code over the wire:
+
+```html
+<script type="module">
+    import { UsaLink } from '@uswds/web-components';
+</script>
+
+<usa-link href="https://designsystem.digital.gov">It's dangerous to go alone. Here, take this.</usa-link>
+```

storybook/getting-started.mdx

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+import { Meta, Markdown, Typeset } from "@storybook/blocks";
+import content from "./getting-started.md?raw";
+
+<Meta title="Getting Started" />
+
+<Markdown>{content}</Markdown>