add FAQ to readme

[mees]

Adds a FAQ to the Readme exaplining pad_mask, pad_mask_dict etc.

[HomerW]

Thanks Oier!

• We should mention that the HistoryWrapper will take care of adding the pad_mask key for you.
• We could potentially put this in the evaluation README instead. That README should probably be more descriptive anyway.

[ceramic-sf]

The additions to the FAQ look good.

A diagram such as the following could also be helpful:

---
title: Historical window size and action chunking
---
flowchart TD
    subgraph history[history windows, `window_size=2`]
        obs_m_1[observation m - 1]
        obs_m[observation m]
    end

    octo
    obs_m_1 & obs_m --> octo

    subgraph action[action chunking, 'pred_horizon=4']

        act_n[action n]
        act_n_1[action n + 1]
        act_n_2[action n + 2]
        act_n_3[action n + 3]
    end
    octo --> act_n & act_n_1 & act_n_2 & act_n_3

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