docs(operators): add documentation for of

[niklas-wortmann]

closes #81

[codecov-io]

Codecov Report

Merging #265 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #265   +/-   ##
=======================================
  Coverage   90.49%   90.49%           
=======================================
  Files         115      115           
  Lines         442      442           
  Branches       10       10           
=======================================
  Hits          400      400           
  Misses         40       40           
  Partials        2        2

Impacted Files	Coverage Δ
src/operator-docs/creation/of.ts	100% <ø> (ø)	⬆️

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[btroncone]

Looks good, just a few suggestions 👍

[btroncone]

I think we want console, not output in the embed http://jsbin.com/porolatazu/embed?js,console

[btroncone]

Few things:

1. It looks like you have conflicting variables with interval
2. I believe you can combine the two concat's

With update it would look something like:

const numbers = of(10, 20, 30);
const letters = of('a', 'b', 'c');
const interval$ = interval(1000);
const result = numbers.pipe(concat(letters, interval$));
result.subscribe(x => console.log(x));

StackBlitz

[niklas-wortmann]

thanks for the feedback. Changes are pushed!