doc: expand readme and makefile

leanprover-community / mathport

Mathport is a tool for porting Lean3 projects to Lean4

Apache License 2.0

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Closed fpvandoorn closed 1 year ago

fpvandoorn commented 1 year ago

Clarify that this repo might not work on Windows
reformulate some of the Oneshot README
add leanproject get-cache in the mathbin-source command
Add git fetch in the lean3-source command.
- This last item conflicts with #232 (note that for mathlib we also do an unrestricted git fetch)