docs: Add Argo CD Core documentation

[leoluz]

Add Argo CD Core documentation

Signed-off-by: Leonardo Luz Almeida leonardo_almeida@intuit.com

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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (9b53eeb) 49.05% compared to head (71caa32) 49.05%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #13225   +/-   ##
=======================================
  Coverage   49.05%   49.05%           
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  Files         246      246           
  Lines       42569    42575    +6     
=======================================
+ Hits        20882    20885    +3     
- Misses      19572    19574    +2     
- Partials     2115     2116    +1     

see 1 file with indirect coverage changes

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[morey-tech]

I'm very excited to see more documentation around the core installation! I've left a few comments with non-blocking nits.

[leoluz]

Thank you @morey-tech for your review. All valuable suggestions!
Addressed all comments.