Add a summary table on starting remote debuggee

[st0012]

I think a table that quickly summarizes all the approaches to open the remote debuggee can help users decide the best approach to pick.

I also think we can leave this table and maybe a piece of quick intro in the README, and move most of the remote debugging doc to a separate file (e.g. docs/remote_debugging.md). Reasons:

• Some users never need to use remote debugging, so they don't need to see those doc every time they are here to see other information.
• For those who does use remote debugging, they may need the docs probably the first 2~3 times they use/set up the project. And then they also won't need to see these docs often.