Extend conda section

[druvus]

I added additional information about the conda install. It is important to setup channels correctly in advance to be able to use the conda install command. An alternative is to add channels together with the install command using -c.

• Is it mergeable?
• make test Did it pass the tests?
• make coverage Is the new code covered?
• Did it change the command-line interface? Only additions are allowed
  without a major version increment. Changing file formats also requires a
  major version number increment.
• Was a spellchecker run on the source code and documentation after
  changes were made?

[codecov-io]

Codecov Report

Merging #427 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #427   +/-   ##
=======================================
  Coverage   90.07%   90.07%           
=======================================
  Files          32       32           
  Lines        4824     4824           
  Branches       36       36           
=======================================
  Hits         4345     4345           
  Misses        478      478           
  Partials        1        1

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[luizirber]

Thanks @druvus!