Added tools section

[Gifford47]

added "Tools" sub-section under help section and inserted some projects.

[jeroenst]

I think this is a good addition to the documentation.

[barbudor]

Most of them are already documented in another place What I don't like in dupplicating information is how it becomes wrong when only one side is updated

[jeroenst]

Good point. Although some tools mentioned here (like mgos-to-tasmota) are not documented yet afaik so that could be added to documentation I guess.

[blakadder]