Write a quickstart guide.

[ekaterinailin]

What needs to be created or improved?

Write a quickstart guide that runs a limited number of use cases for AltaiPony.

Can you provide an example?

import altaipony
lc = get_k2sc_lc(some_id)
lc = lc.k2sc_detrend()
flares = find_flares(lc)
plot(flares)

What is the goal / expected behaviour?

Instructions will help make the structure of the code more transparent for users and will expose counter-intuitive implementations such as unclear object (e.g. methods) names.

[ekaterinailin]

See this notebook.