Add svg icon templates

I added svg icon templates, which give a good start for anyone needing an app icon with Sailfish look. Do you want to include them in your Helloworld project?

I release all these into public domain:

The author or authors of this contribution dedicate any and all copyright interest in this contribution to the public domain. We make this dedication for the benefit of the public at large and to the detriment of our heirs and successors. We intend this dedication to be an overt act of relinquishment in perpetuity of all present and future rights to this code under copyright law.