Add Readme

Author: swissmanu

README.md

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+# 🤹‍♂️ Playground: RxJS Debugging for Visual Studio Code
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+> This repository contains a playground to explore the debugging capabilities of the [RxJS Debugging for Visual Studio Code](https://github.com/swissmanu/rxjs-debugging-for-vscode) extension.
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+## Usage
+
+### Github Codespaces
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+You can use a [Github Codespace](https://github.com/features/codespaces) to explore the extensions functionality without any modification to your local development system as illustrated in the following:
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+- Open the repository in a Codespace.
+- Install recommended extensions by confirming the regarding prompt.
+- Enable some [operator log points](https://github.com/swissmanu/rxjs-debugging-for-vscode#operator-log-points) in `observable.ts`.
+- Run the playground using the "Launch Program" launch configuration: This executes the playground with NodeJS.
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+![Playground with Codespaces](./docs/codespaces.gif)
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+### Local Setup
+
+- Clone this repository.
+- Install dependencies using `yarn` or `npm`, depending on your flavor.
+- Open the cloned repository with Visual Studio Code.
+- Code will automatically recommend to install the "RxJS Debugging for Visual Studio Code" extension: Confirm this prompt.
+- Enable some [operator log points](https://github.com/swissmanu/rxjs-debugging-for-vscode#operator-log-points) in `observable.ts`.
+- Run the playground using the "Launch Program" launch configuration: This executes the playground with NodeJS.
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