添加reddit频道

[jack-wz]

Clear and concise description of the problem

能使用reddit频道的订阅内容

Suggested solution

添加reddit频道的订阅内容

Alternative

No response

Additional context

No response

Validations

• [X] Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[linear[bot]]

FOL-137 添加reddit频道

[TonyRL]

Follow can indeed subscribe to Reddit.

[DIYgod]

Duplicate of #346