Add vector tile layer

[MichalPoty]

I have tried to add a vector tile layer (in .pbf format), but unsuccessfully, because there is no component for it. In the VueLayers version (Vue 2) there are vl-layer-vector-tile and vl-source-vector-tile components, but they are missing here.

Is there a reason for this not being implemented yet?

[d-koppenhagen]

Sure it can be added.
Do you like to contribute? It should be straight-forward, comparing with the other source / layers.

Do you have a link for a public pbf source or one with demo credentials?

[MichalPoty]

Great,
Yes, I'd like to contribute, but I don't have much experience with it yet, so I might need some help.

Here should be the public pbf source from the official OL examples:
https://basemaps.arcgis.com/arcgis/rest/services/World_Basemap_v2/VectorTileServer/tile/{z}/{y}/{x}.pbf

[okame]

You'll excuse me from the side.
I added "ol-vector-tile-layer" component just now.
Can I contribute this works?
(I don't udpate documents yet.)

okame@73e0932

[okame]

@d-koppenhagen
Hello, I added "ol-vector-tile-layer" component.
Could you review this PR?
#229

[d-koppenhagen]

Just released version 1.2.0 with this feature added.