Get 1st time open source contributions

[sauloperez]

I believe many issues of this repo could be solved by newbies or first-timers. They are simple enough to jump in and get confidence and experience.

Some sites that showcase open source issues for newcomers are: https://www.codetriage.com/, http://up-for-grabs.net, https://contributor.ninja/, http://www.firsttimersonly.com/, https://yourfirstpr.github.io/ we could post them there.

To do that thought we should describe these issues in detail providing links to the particular files, methods, lines, etc. where things should be implemented.