UX improvement for adding external JARs

[nickzhums]

Per survey user feedback, it seems the way to add external JARs is sometimes not obvious or straightforward to the users, especially users who come from IDE background, so creating this issue for discussion

Original words: “No intuitive way to add external JARs. Just learning Java and had to install Eclipse to figure it out”

[nickzhums]

Seems users expect a lot of action from right clicks, so one proposal is to add "external JAR" when user clicks on the "dependencies" in the project explorer