DOC: Generic Surface

[MateusStano]

Pull request type

• [x] ReadMe, Docs and GitHub updates

Description

• Added docs page describing usage of the GenericSurface classes

• Added GenericSurface and LinearGenericSurface doc strings to reference docs

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 74.89%. Comparing base (4815fc1) to head (78fb46c). Report is 12 commits behind head on enh/generic-surfaces.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## enh/generic-surfaces #690 +/- ## ======================================================== + Coverage 74.85% 74.89% +0.04% ======================================================== Files 98 98 Lines 11012 11006 -6 ======================================================== Hits 8243 8243 + Misses 2769 2763 -6 ```

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