added readme

Author: geakstr

readme.md

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+### Description
+
+Starter pack for Svelte 3/Rollup/Typescript/Visual Studio Code:
+
+- Typescript support inside Svelte components with [https://github.com/PaulMaly/svelte-ts-preprocess](svelte-ts-preprocess)
+- Also it adds some support for Visual Studio Code and [https://github.com/UnwrittenFun/svelte-vscode](https://github.com/UnwrittenFun/svelte-vscode) extension (via `svelte.config.js`)
+- Supports `index.html` entry file and dev server to serve it
+- See all in `rollup.config.js`.
+
+### How to start
+
+```
+git clone https://github.com/geakstr/svelte-3-rollup-typescript-vscode.git
+cd svelte-3-rollup-typescript-vscode && rm -rf .git && npm install
+```