Add Alert rules and contact points to README

[mickeypash]

Add Alert rules and Contact points as supported resources to the README

[safaci2000]

@mickeypash thanks for the update, I'll merge this in but keep in mind that these are very alpha. I'm still tryin to figure out how to capture all alerting entities (not just contact points) and the API of the payload may change before being released as an overall feature (ie. Alerting with all related entities listed in #134 )

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.04%. Comparing base (e0e1cbb) to head (46a0616).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #314      +/-   ##
==========================================
- Coverage   46.98%   44.04%   -2.95%     
==========================================
  Files          84       84              
  Lines        6530     6530              
==========================================
- Hits         3068     2876     -192     
- Misses       3100     3324     +224     
+ Partials      362      330      -32     

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