modify readme, add example

README.md

@@ -1,3 +1,35 @@
 # logging
 
 日志组件
+
+## 使用说明
+
+日志组件封装了uber/zap，使用基本一致
+
+```
+package main
+
+import(
+    "git.hpds.cc/Component/logging"
+    
+    "go.uber.org/zap/zapcore"
+)
+
+func main(){
+    opt := Options{
+        Path           : "./log/",
+        Prefix         : "",
+        ErrorFileSuffix: "",
+        WarnFileSuffix : "",
+        InfoFileSuffix : "",
+        DebugFileSuffix: "",
+        Level          : zapcore.DebugLevel,
+        MaxSize        : 100,
+        MaxBackups     : 1000,
+        MaxAge         : 30,
+        Development    : true,
+    }
+    logger := logging.NewLogger()
+    logger.Info("this is a test log")
+}
+```