Add license headers to R-package

[anirudhacharya]

Description

Add license headers to all files in R-package.

Current MXNet release instructions requires all files in the R-package to be removed until licensing issues are resolved, before we build the tar file. This PR is to resolve those licensing issues.

Comments

• @hetong007 @ankkhedia @lupesko @sandeep-krishnamurthy

[lupesko]

Thanks for addressing the licensing issue!

[lupesko]

@anirudhacharya The R-Package folder also contains a LICENSE file, which is not an Apache2.0 license. How are we addressing it?

[lupesko]

@mxnet-label-bot [pr-awaiting-review]

[sandeep-krishnamurthy]

Thanks @anirudhacharya
Please add Apache 2.0 license header to all examples under demo/
We need to update the R-Package LICENSE file as well

[ankkhedia]

@anirudhacharya The R-Package folder also contains a LICENSE file, which is not an Apache2.0 license. How are we addressing it?

Should we just remove that license and after adding Apache license to every file.

[anirudhacharya]

@ankkhedia why should we remove the file? scala, clojure and cpp package also have LICENSE files.

[ankkhedia]

@ankkhedia why should we remove the file? scala, clojure and cpp package also have LICENSE files.

But python don't have. I don't mind it having over there just that if adding headers to all the files suffices do we need an extra file?
Maybe @lupesko and @sandeep-krishnamurthy can comment on it.

[sandeep-krishnamurthy]

@ankkhedia - I do not have a strong opinion but it is good to have in the base package folder.