Write/add new tutorials

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## Hacktoberfest

If you want to take part in Hacktoberfest have a look at https://hacktoberfest.digitalocean.com/
> Hacktoberfest encourages participation in the open source community, which grows bigger every year. Complete the 2021 challenge and earn a limited edition T-shirt.

## How to participate:

Write a Titanium tutorial (Github, Medium, personal blog,...) and add a link in the "[External Tutorials](https://github.com/m1ga/from_zero_to_app#external-tutorials)" section.
Every level is accepted! It can be for beginners like how to start, how to style your elements or advanced stuff like data binding or UI effects. Even tutorials about VSCode and Titanium are welcome!

## Requirements
* has to be a Titanium tutorial of course :-)
* make sure your code is working with SDK 10.x
* you can add old tutorials too (should still work and be valid of course)
* you should be the author of the tutorial

## How to get started:
If you are new to Titanium you might want to look at
* https://github.com/m1ga/from_zero_to_app/blob/master/installation.md
* https://github.com/m1ga/from_zero_to_app/blob/master/first_app.md
* https://titaniumsdk.com/
* other tutorials https://fromzerotoapp.com/

Read the README's External Tutorials section, then review installation.md, first_app.md, and the existing tutorials to choose a topic and confirm the expected link format. Write an original Titanium tutorial that works with SDK 10.x, verify its code, and add its link to External Tutorials.

Written by the indexing model from the issue text.