hi, roughly finished 2 marjor feature

[JialinWang1]

i had roughly finished 2 marjor feature without testing, casue the time is so limited that i still have to go to work today. In my plan (which is not implemented..), the test will be inclueding these using enzyme:

1. component rendering testing for each component
2. functional testing for each single function as "unit test", like tesing reducers exported function: players(state = initialState, action) to see if it returns the value as expected, and doesnt changed the state that passed as parameter.
3. integration test for componet group like player list with player list item, to see if it works well as expect together.