Add RTM section for docs v2

[shaydewael]

Summary

Adds very basic information on using the RTMClient with v2

Based from #427

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

Merging #477 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #477   +/-   ##
=======================================
  Coverage   69.58%   69.58%           
=======================================
  Files          15       15           
  Lines        1654     1654           
  Branches       91       91           
=======================================
  Hits         1151     1151           
  Misses        481      481           
  Partials       22       22

---

Continue to review full report at Codecov.

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[codecov]

Codecov Report

Merging #477 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #477   +/-   ##
=======================================
  Coverage   69.58%   69.58%           
=======================================
  Files          15       15           
  Lines        1654     1654           
  Branches       91       91           
=======================================
  Hits         1151     1151           
  Misses        481      481           
  Partials       22       22

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update df5351f...83294f9. Read the comment docs.