Add simple preprocessing workflow

[ssnn-airr]

Original report by Jason Vander Heiden (Bitbucket: javh, GitHub: javh).

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It might be worth it to add a simplified preprocessing workflow to the docs. Eg:

1. AssemblePairs
2. FilterSeq
3. CollapseSeq

[ssnn-airr]

Original comment by Jason Vander Heiden (Bitbucket: javh, GitHub: javh).

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We can use the clontech pipeline for this. Need to find suitable public data.