chore: enhance library skeleton readme with some library instructions (#9128)

* chore: enhance library skeleton readme with some library instructions

* tweak

* Update packages/create-svelte/shared/+skeletonlib/README.md

Co-authored-by: gtmnayan <[email protected]>

---------

Co-authored-by: gtmnayan <[email protected]>

Author: dummdidumm

Diff for: .changeset/curvy-lobsters-hug.md

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+---
+'create-svelte': patch
+---
+
+chore: enhance library skeleton readme with some library instructions

Diff for: packages/create-svelte/shared/+skeletonlib/README.md

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+# create-svelte
+
+Everything you need to build a Svelte library, powered by [`create-svelte`](https://github.com/sveltejs/kit/tree/master/packages/create-svelte).
+
+Read more about creating a library [in the docs](https://kit.svelte.dev/docs/packaging).
+
+## Creating a project
+
+If you're seeing this, you've probably already done this step. Congrats!
+
+```bash
+# create a new project in the current directory
+npm create svelte@latest
+
+# create a new project in my-app
+npm create svelte@latest my-app
+```
+
+## Developing
+
+Once you've created a project and installed dependencies with `npm install` (or `pnpm install` or `yarn`), start a development server:
+
+```bash
+npm run dev
+
+# or start the server and open the app in a new browser tab
+npm run dev -- --open
+```
+
+Everything inside `src/lib` is part of your library, everything inside `src/routes` can be used as a showcase or preview app.
+
+## Building
+
+To build your library:
+
+```bash
+npm run package
+```
+
+To create a production version of your showcase app:
+
+```bash
+npm run build
+```
+
+You can preview the production build with `npm run preview`.
+
+> To deploy your app, you may need to install an [adapter](https://kit.svelte.dev/docs/adapters) for your target environment.
+
+## Publishing
+
+Go into the `package.json` and give your package the desired name through the `"name"` option. Also consider adding a `"license"` field and point it to a `LICENSE` file which you can create from a template (one popular option is the [MIT license](https://opensource.org/license/mit/)).
+
+To publish your library to [npm](https://www.npmjs.com):
+
+```bash
+npm publish
+```