docs(palimpsest): add initial set-up

Supports #100

palimpsest/README.md

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+# palimpsest
+
+> pa·​limp·​sest
+
+> writing material used one or more times after earlier writing has been erased – Merriam-Webster
+
+The purpose of this app is to document and illustrate real world consumption of `carbon-components-svelte`.
+
+## Getting Started
+
+This app uses a linked copy of `carbon-components-svelte` to expedite local development.
+
+First, run the following commands at the root of `carbon-components-svelte/`:
+
+```bash
+yarn build
+yarn link
+```
+
+Next, link the library to this folder.
+
+```bash
+cd palimpsest
+yarn link "carbon-components-svelte"
+```
+
+Finally, install this app's dependencies.
+
+```bash
+yarn install
+```
+
+## Available Scripts
+
+### `yarn start`
+
+Runs the app in development mode with livereload enabled. Visit [http://localhost:8080](http://localhost:8080).
+
+### `yarn build`
+
+Builds the app in production mode.