Add license

[phil-davis]

While doing Makefile refactoring I noticed that this repo has no LICENSE file.

I copied this one from another public app repo.

[codecov]

Codecov Report

Merging #716 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             master    #716   +/-   ##
========================================
  Coverage      83.9%   83.9%           
  Complexity      502     502           
========================================
  Files            45      45           
  Lines          1802    1802           
========================================
  Hits           1512    1512           
  Misses          290     290

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[PVince81]

we should script this and push it to all repos

[phil-davis]

There are quite a lot of public app repos without a LICENSE file. I guess they should all be the same - GPL v2 or v3?

[phil-davis]

I raised issue owncloud/QA#610 to address the general problem across apps.
@PVince81 close this for now? For approve and merge?

[PVince81]

please close, it's the wrong license anyway, see https://github.com/owncloud/activity/blob/master/appinfo/info.xml#L16