Make dependency on robometry optional and add it in the documentation

[lrapetti]

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In https://github.com/robotology/human-dynamics-estimation/pull/298 we forgot to update the documentation with the robometry dependency.

[lrapetti]

Note that the library is still marked as Under Development. We might think of making this dependency optional

[RiccardoGrieco]

Note that the library is still marked as Under Development. We might think of making this dependency optional

If we want to make it optional we should address it also in the device CMakeLists.txt

[lrapetti]

Note that the library is still marked as Under Development. We might think of making this dependency optional

If we want to make it optional we should address it also in the device CMakeLists.txt

Yess, it has been addressed in https://github.com/robotology/human-dynamics-estimation/pull/323/commits/165183da985950e8524b091814c96ba8825ce4cd. I have changed the title of the PR to reflect this change

[lrapetti]

@RiccardoGrieco do you have any further comment or can we merge it?