Created Extensive footer controls (markdown)

Extensive-footer-controls.md

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+Footer is highly configurable, enabling almost anyone to set it up to own taste.
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+You have sort manager to sort footer elements in order you prefer:
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+![](https://user-images.githubusercontent.com/22982594/64973147-c739ba80-d8aa-11e9-986b-d6928556afb6.png)
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+More info on sorting footer elements can be found [here.](https://github.com/koreader/koreader/pull/5389)
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+You can place progress bar in second line, allowing all other footer elements to be visible at once with enough room:
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+![](https://user-images.githubusercontent.com/22982594/65269069-ba220300-db18-11e9-87f5-96c315507fdf.png)
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+More info on progress bar in second line can be found [here.](https://github.com/koreader/koreader/pull/5405)
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+How footer is shown is also very configurable, with many different options:
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+![](https://user-images.githubusercontent.com/22982594/63041720-c76c2200-bec8-11e9-9f5a-eadb73c8c8cf.png)
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+It includes pull requests for [many options](https://github.com/koreader/koreader/pull/5203), [status bar alignment](https://github.com/koreader/koreader/pull/5195), [new memory icon](https://github.com/koreader/koreader/pull/5300) and [minor fix](https://github.com/koreader/koreader/pull/5218).