Manually add a policy group

The selection of policy in subscription rules becomes parent policy group
Become a secondary policy group by add in strategy group / actively add a second child policy group to become a substrategy group
Actively add subscribe node or filter subscription node to become an agent strategy group

Enter `Strategy Group` to add a strategy group

If the user wants to add a strategy group nested with other strategies into a substrategy group, please click here Jump to Nesting between Child and Mother Strategy Groups tutorial
If the user wants to add a subscribe node or filter subscription node to the added policy group to become a agent policy group, please click [here](https://github.com/chiupam/tutorial/blob/master/ Loon/Plus/Remote_Proxy_in_Proxy_Group.md) Jump to the Nesting between nodes and policy groups tutorial

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