[REQUEST] 给项目增加Tag和通过Tag查询项目

[RongqinChen]

🤩 Features description [Please make everyone to understand it]

给项目打Tag，然后根据Tag快捷查找属于同一类的项目。

👍 What problem does this feature solve

方便项目的归类和查找。

👾 What does the proposed API look like

可以参考overleaf的界面。

🚑 Any additional [like screenshots]