Add section to wiki for testing with product flavors

[misaochan]

I just realized that we don't seem to have anything on our wiki on how to test the app (as far as I can see). With #857 merged, I think it would be good to have a page on the wiki explaining to newcomers how this works, so that people don't send bad images to real Commons servers, or feel like they can't do any testing because they don't have proper images to upload.

[whym]

Should it cover things like these for the beta site/flavor?

• Beta site: https://commons.wikimedia.beta.wmflabs.org/
  • Beta site's account creation: https://commons.wikimedia.beta.wmflabs.org/w/index.php?title=Special:CreateAccount
  • Beta site's upload form: https://commons.wikimedia.beta.wmflabs.org/w/index.php?title=Special:UploadWizard
• What to upload:
  • Take a picture with camera (emulator's pseudo camera should give you images of a moving square)
  • Find a public domain image and copy it from https://commons.wikimedia.org/wiki/Category:Public_domain (and probably a good idea to shrink images before uploading for quicker response during testing)

[misaochan]

@whym Looks good to me. I think we could also emphasize that with the beta flavor, it's okay to keep uploading duplicate images or bad images as they won't be sent to the actual Commons server?

[misaochan]

@sepicoder It is yours. :)