add follow entity dao and xml

Helius

2020-07-29 76c24821c597984767760282301418f35f3cd9d3

 src/main/java/com/xcong/excoin/modules/coin/service/BlockCoinService.java

@@ -10,4 +10,8 @@

    public void updateBtc();

    public void updateEos();

    public void updateXrp();

}