Create a include to implement a tab for android and ios code example

[muuki88]

To reduce duplication for the mobile SDK documentation, we should provide a simple tab component that lets you specify Kotlin and Swift code. The explanations are mostly the same and only the code differs.

Resources

• https://getbootstrap.com/docs/4.6/components/navs/#javascript-behavior
• https://jekyllrb.com/docs/includes/
• https://jekyllrb.com/docs/includes/#passing-parameter-variables-to-includes

{% capture iosCode %}
 ```swift
 This is some neat swift code
 ``
{% endcapture %}

{% capture androidCode %}
```kotlin
This is some neat swift code
``
{% endcapture %}

{% include code/mobile-code.html swift=iosCode kotlin=androidCode %}