Articles manager

[petuhovskiy]

Successor of #3 idea.

• Add articles
• Read article (open link for now)
• Change article status ["UNOPENED", "VIEWED", "COMPLETED"]
• Change article tags
• Filter articles
• Articles rating

[petuhovskiy]

NOTE: Articles are added normally, but client won't show added articles and update notes by default.
FIXME

[petuhovskiy]

NOTE: Articles are added normally, but client won't show added articles and update notes by default.
FIXME

FIXED