[FEA] Document how decimal columns work
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Python
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- C++
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Description
**Is your feature request related to a problem? Please describe.**
We need to add some user-facing documentation on how our decimal columns work and various binops with a few walk-through examples.
Some high-level pointers:
- [x] Explain what `scale` & `precision` are.
- [ ] Explain how binops calculate the results.
- [ ] Explain how dtypes are deduced for binops.
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