Add composer support

[franklinkim]

Added a composer.json file for using composer to install the extension.

[d0mme-zz]

@enesf: Can you please check this pull request and merge it, if ok? Thanks in advance.

[ghost]

Hello franklinkim,

if you use more than 1 module which uses the composer in this way, won't the composer files override each other?

Best Regards

Edip

[franklinkim]

Don't quite understand what you mean... take a look at magento-composer-install to see how it works