misc: Add FAQ page (lifted from the wiki)

[FabioLuporini]

if we do this, we should also update the FAQ link in the wiki (and drop the page there)

[codecov]

Codecov Report

Merging #1976 (774720c) into master (1d98eb1) will increase coverage by 0.02%.
The diff coverage is 87.37%.

❗ Current head 774720c differs from pull request most recent head dd1aac3. Consider uploading reports for the commit dd1aac3 to get more accurate results

@@            Coverage Diff             @@
##           master    #1976      +/-   ##
==========================================
+ Coverage   87.88%   87.90%   +0.02%     
==========================================
  Files         213      214       +1     
  Lines       36196    36232      +36     
  Branches     5449     5465      +16     
==========================================
+ Hits        31810    31849      +39     
+ Misses       3877     3868       -9     
- Partials      509      515       +6     

Impacted Files	Coverage Δ
tests/test_gpu_common.py	1.50% <0.00%> (ø)
tests/test_operator.py	97.69% <ø> (-0.14%)	⬇️
devito/ir/iet/visitors.py	81.79% <80.85%> (+0.16%)	⬆️
devito/tools/utils.py	82.79% <82.92%> (+1.21%)	⬆️
devito/types/parallel.py	83.95% <83.33%> (+1.11%)	⬆️
devito/passes/iet/definitions.py	84.12% <86.15%> (+0.16%)	⬆️
devito/types/basic.py	94.72% <87.87%> (+0.46%)	⬆️
devito/types/object.py	92.38% <92.38%> (ø)
devito/types/array.py	96.00% <95.00%> (+4.19%)	⬆️
devito/finite_differences/differentiable.py	95.19% <100.00%> (-0.37%)	⬇️
... and 21 more

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[georgebisbas]

If you look at the rich diff some of them do not link to the place where the question is answered.
e.g.: Do Devito Operators release the GIL when executing C code?

[FabioLuporini]

If you look at the rich diff some of them do not link to the place where the question is answered.
e.g.: Do Devito Operators release the GIL when executing C code?

same in the wiki?

[georgebisbas]

If you look at the rich diff some of them do not link to the place where the question is answered.
e.g.: Do Devito Operators release the GIL when executing C code?

same in the wiki?

As I see, yes.