Add shadow customization to the shared view

[javisanesp]

Hello there.

I am making this PR because on our project https://github.com/meganz/iOS our designers request us to add some customization to this HUD and to add it some depth from the background views AKA shadow 😄 . I do not know if this could be done with other methods, but just in case you find it useful.

I did not added properties for this layer values because I think they are not necessary.

I wrote the defaults values that appear on the Apple documentation on the comments of the methods in the header file.

In case you are interested on this PR, please tell me if I need to add or change anything so you can merge it, if not please feel free to close the PR.

Thank you for your time.

Cheers!

[honkmaster]

This PR is missing updates to the Readme. Please add.

[javisanesp]

Sorry about that, forgot to add them. All good?

[ibtikarat]

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+[SVProgressHUD setShadowColor:]: unrecognized selector sent to class 0x1092c3618'
I have crashed

[javisanesp]

Hello @ibtikarat.
Can you explain how did you crash? Are you pointing to the branch meganz:shadow_customization to use the method setShadowColor?

[javisanesp]

Sorry to bother again @honkmaster, but... Am I missing something? Can I help you?

[reinaldosmoraes]

@javisanesp it looks great and I'd like to use it. @honkmaster Is this PR ready to be merged? If so, can you merge it, please?

[jnavarrom]

Hi @honkmaster

Please, would you mind reviewing this PR when you have time?
Any more changes we need to make on our end?

Thank you

[arielelkin]

Hello @honkmaster. We're also interested in this feature being merged. Please let us know if we can help 😀

[jnavarrom]

@juliensaad can you take a look at this PR when you have time?

Thanks!

[javisanesp]

@MuteQ sorry to bother, I saw that you merged a PR recently. Could you please take a look to this one?