docs(guide/External Resources): Added a course

[packtpartner]

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

feature

What is the current behavior? (You can also link to an open issue here)

linked to course

What is the new behavior (if this is a feature change)?

linked to course

Does this PR introduce a breaking change?

Please check if the PR fulfills these requirements

• The commit message follows our guidelines: https://github.com/angular/angular.js/blob/master/CONTRIBUTING.md#commit-message-format
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Other information:

Added a new course under Paid Onsite

[petebacondarwin]

This course is actually "paid online" not "paid onsite". But I will fix up and merge.

[packtpartner]

Sorry for my ignorance. Thanks @petebacondarwin
Do I need to put in a pull request again?

[gkalpak]

@packtpartner, @petebacondarwin fixed that while merging - you don't need to do anything 😄

[packtpartner]

@gkalpak thanks a lot. Will it show on https://docs.angularjs.org/guide/external-resources anytime soon?

[gkalpak]

@packtpartner, it should be visible already.

[petebacondarwin]

It is now that our CI server got back up and running

[packtpartner]

Sorry for the trouble, but I am still unable to see it featured on https://docs.angularjs.org/guide/external-resources @petebacondarwin @gkalpak

[gkalpak]

Hm...it is listed (as Packt) under Courses > Paid online. (You had originally added it under Courses > Paid on-site).

But looking at it, it looks morw like a book, right?

[petebacondarwin]

It is an online course.

[petebacondarwin]

It is just packaged as an ebook

[packtpartner]

Thanks for all your help @petebacondarwin @gkalpak :)