[openstreetmap/openstreetmap-website] add Sotm Asia 2019 banner (#2394)

[Fazle Rabbi]

this PR adds [Sotm Asia 2019](https://stateofthemap.asia) banner to [openstreetmap.org](https://openstreetmap.org).

this is how it looks in a local build.

full page:
![image](https://user-images.githubusercontent.com/11360512/66916168-7dc0c480-f03c-11e9-82a1-0ff831eaf8e8.png)

closer look:
![image](https://user-images.githubusercontent.com/11360512/66916196-887b5980-f03c-11e9-942e-d9f7f2d11d33.png)

on hover:
![image](https://user-images.githubusercontent.com/11360512/66917002-4d7a2580-f03e-11e9-893a-d8e85a7f5b7d.png)



You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/2394

-- Commit Summary --

  * modify banners.yml to add SotM Asia 2019
  * add sotm_asia_2019.png for StoM Asia 2019 banner image

-- File Changes --

    A app/assets/images/banners/sotm_asia_2019.png (0)
    M config/banners.yml (12)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/2394.patch
https://github.com/openstreetmap/openstreetmap-website/pull/2394.diff

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