Add profile

[christophfroehlich]

What could we write there?

This will be shown here https://github.com/ros-controls, see
https://github.com/ros2 as an example

[soham2560]

@christophfroehlich I think following the same style as https://github.com/ros2 makes sense, the same format can be seen at https://github.com/gazebosim too
Basic structure is

- About
- Getting Started
- Community Resources
- Developer Resources

I've added an overly rough draft at
https://github.com/soham2560/.github/tree/add/profile_draft/profile if you want to have a look

[christophfroehlich]

Looks great, could you open a PR targeting the master branch please?

[soham2560]

@christophfroehlich refer #3