Add github templates for bug reports and features. Also links for important ROS related sites.

[peterborkuti]

Hi, I checked #779 and I thought, I could help. This is what you were thinking about?

You can try the configurations here: https://github.com/peterborkuti/launch/issues

Here is how it looks like:

I was thinking about creating drop downs with OS and DDS versions.

Hope you like it Péter