Add storybook RxJS 6

Author: rstropek

rxjs-whats-new-6/readme.md

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+# What's New in RxJS 6
+
+## Pipes
+
+* Change introduced in RxJS 5.5
+* Recommended syntax
+* Patching vs. imported functions:
+  * Patched `Observable` in 5.4; note side effects
+  * Set breakpoint in new version ([RxJS 5.5](rxjs-5-5/src/app.ts)) and show cleaner `Observable`
+  * Note: Renamings were necessary (e.g. `do` became `tap`)
+
+### Demo
+
+* View old syntax in [RxJS 5.4](rxjs-5-4/src/app.ts)
+* View new syntax in [RxJS 5.5](rxjs-5-5/src/app.ts)
+* Patching vs. imported functions:
+  * Set breakpoint in old version ([RxJS 5.4](rxjs-5-4/src/app.ts)) and show patched `Observable`; note side effects
+  * Set breakpoint in new version ([RxJS 5.5](rxjs-5-5/src/app.ts)) and show cleaner `Observable`
+* Walkthrough [pipeable operators](https://github.com/ReactiveX/rxjs/blob/master/doc/pipeable-operators.md) ([RxJS 5.5](rxjs-5-5/src/app.ts))
+
+## Imports
+
+* Much clearer syntax in RxJS 6
+* Easier to learn, easier to remember
+
+### Demo
+
+* View old syntax in [RxJS 5.4](rxjs-5-4/src/app.ts)
+* View new syntax in [RxJS 5.5](rxjs-5-5/src/app.ts)
+
+## *rxjs-compat*
+
+* Installing [*rxjs-compat*](https://www.npmjs.com/package/rxjs-compat) makes RxJS 6 compatible to 5.4
+* Intermediate step for large projects
+
+### Demo in [RxJS 5.4](rxjs-5-4/src/app.ts)
+
+```bash
+npm uninstall rxjs
+npm install rxjs
+npm run build
+npm install rxjs-compat
+npm run build
+npm start
+```
+
+## Migrate from RxJS 5 to 6 with [*rxjs-tslint*](https://github.com/ReactiveX/rxjs-tslint)
+
+*tslint* rule rewriting your code for RxJS 6
+
+### Demo in [RxJS 5.4](rxjs-5-4/src/app.ts)
+
+Note: Open [*app.ts*](rxjs-5-4/src/app.ts) while running migration
+
+```bash
+rxjs-5-to-6-migrate -p tsconfig.json
+npm uninstall rxjs
+npm install rxjs
+npm run build
+npm start
+```
+
+## Synchronous Error Handling
+
+`try/catch` can no longer catch synchronously thrown errors. You need to specify e.g. an error callback.
+
+### Demo
+
+* Show thrown error in [RxJS 5.5](rxjs-5-5/src/app.ts)
+* Show thrown error in [RxJS 6](rxjs-6/src/app.ts)
+
+## Further Readings
+
+* Video: [*Introducing RxJS6!* by Ben Lesh](https://youtu.be/JCXZhe6KsxQ)
+* [RxJS Change Log](https://github.com/ReactiveX/rxjs/blob/master/CHANGELOG.md)
+* Blog: [*RxJS 6: What's new and what has changed?* by Auth0](https://auth0.com/blog/whats-new-in-rxjs-6/)
+* Docs: [RxJS v5.x to v6 Update Guide](https://rxjs-dev.firebaseapp.com/guide/v6/migration)