Add a cost estimate for Terra

[aofarrel]

One of the biggest things our users on BDC ask about are costs. Right now we do not have a reliable way of predicting them -- Brian Hannafious made a cost estimator notebook, and while it is quite accurate when it gets good data from fiss, but I discovered that sometimes fiss can give wildly incorrect times that don't match the logs, so this is the result of the raw data I can glean from Terra's UI and isn't all that granular.

[aofarrel]

It might be more appropriate to put this information in the Dockstore metadata, but I'm a little confused as to how that's set up on this repo -- the metadata on Dockstore clearly refers to just the aligner but .Dockstore.yml in this repo doesn't have that information inside of it, so I don't know where the Dockstore-specific information is being pulled from.

Also, this does not contain the changes of #112 so the checks showing as failed are expected.

[wshands]

There is information about adding metadata to workflows here:
https://docs.dockstore.org/en/develop/advanced-topics/best-practices/best-practices.html
https://docs.dockstore.org/en/develop/advanced-topics/best-practices/wdl-best-practices.html

https://docs.dockstore.org/en/develop/getting-started/getting-started-with-cwl.html?highlight=readme
https://docs.dockstore.org/en/develop/getting-started/getting-started-with-wdl.html?highlight=readme
Dockstore uses the authorship information and description from the descriptor file to populate metadata for tools.
Note
If no description is defined in the descriptor file, the README from the corresponding Git repository is used.