##Function User can register and login for post your "Seeds".

"Seed" has two different types. One is 'public', another one is 'private'.

In terms of 'public' seeds, everyone in your friends' circle can see them. But as for 'private' seeds, nobody can see except you.

User also can add and search friends who have already registered in our app.

User can view friends' activities synchronously.

User can chat with others who must be in the friend list.