Add Windows installation; move installation in README to tutorial

[mabelzhang]

Partially addresses gazebosim/docs#117 and gazebosim/docs#14 (comment) .

• Adds Windows binary and from source install instructions for Windows installation instructions per library docs#117 .
  For some reason, I didn't encounter the compilation error @JShep1 mentioned here Top-level Windows installation instructions docs#96 (comment) .
  My steps are slightly different, as necessitated by these per-package installation tutorials.
  John built everything from source using colcon.
  I did conda-forge binary install for ign-cmake and ign-math, and then pure cmake.
  Not sure if that makes the difference or I'm missing something.

• Moves installation in README to a new installation tutorial page for Consolidate Library READMEs with installation tutorials docs#14 (comment) .
  TODO: The URL in README currently links to ign-common tutorials main page, since the installation tutorial webpage doesn't exist yet. Somebody should change the link after this PR is deployed. Trivial fix of the URL in README line 63.

[codecov]

Codecov Report

Merging #146 (113c79b) into ign-common3 (af8a83f) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           ign-common3     #146   +/-   ##
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  Coverage        75.53%   75.53%           
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  Files               69       69           
  Lines             9623     9623           
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  Hits              7269     7269           
  Misses            2354     2354           

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[traversaro]

Not sure if that makes the difference or I'm missing something.

The difference is that the ignition-cmake available in conda-forge contains a patch to fix the GTS-problem reported by @JShep1 :

• https://github.com/conda-forge/libignition-cmake0-feedstock/blob/master/recipe/FindGTS.cmake.patch
• https://github.com/conda-forge/libignition-cmake0-feedstock/blob/master/recipe/meta.yaml#L15

So the problem is still present if ignition-cmake is compiled from source when building all the ignition projects together with colcon, but not present if ignition-cmake is installed via conda-forge.

[JShep1]

Small consistency nit but LGMT otherwise

[mabelzhang]

Same comment about formatting as gazebosim/gz-math#185 (comment)
fb6323a tries to fix it.

I'm not sure if that fixes it though. Looking at the profiler tutorial in this repo, Troubleshoot section, bullets 2 and 4 have code blocks, one with a preceding empty line and one without, both rendered incorrectly. So the empty line isn't the answer. Do you think changing from 4 spaces to 2 spaces helps??? Notably, the {.sh} doesn't help either, because the ign-physics tutorial that renders correctly doesn't have that, these incorrect ones do.

[mabelzhang]

Formatting has been fixed, given the tip in the other PR.
So yeah, 2 spaces made a difference!