Add README and weights for V2 and V3

README.md

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+---
+license: mit
+---
+
+MobileNet models ported from [torchvision](https://pytorch.org/vision/stable/index.html) for use with [Metalhead.jl](https://github.com/FluxML/Metalhead.jl). The script for creating this file can be found [here](https://github.com/FluxML/Metalhead.jl/blob/master/scripts/port_torchvision.jl).
+
+To use this model in Julia, [add the Metalhead.jl package to your environment](https://pkgdocs.julialang.org/v1/managing-packages/#Adding-packages). Then execute:
+```julia
+using Metalhead
+
+# MobileNet V2 model
+model = MobileNetv2(pretrain=true)
+
+# MobileNet V3 models
+model = MobileNetv3(:small, pretrain=true)
+model = MobileNetv3(:large, pretrain=true)
+```

mobilenet_v2-IMAGENET1K_V2.tar.gz

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+size 13168693

mobilenet_v3_large-IMAGENET1K_V2.tar.gz

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mobilenet_v3_small-IMAGENET1K_V1.tar.gz

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