add test example and readme

README.md

@@ -1,2 +1,26 @@
 # ion-log
-golang logger used by ion
+## QuickStart
+```
+package main
+
+import (
+	log "github.com/pion/ion-log"
+)
+
+func init() {
+	fixByFile := []string{"asm_amd64.s", "proc.go"}
+	fixByFunc := []string{}
+	log.Init("debug", fixByFile, fixByFunc)
+}
+
+func main() {
+	log.Infof("Hello ION!")
+}
+```
+## Feature
+* GoodFormat: [date time] [Level] [Line][File][Func] => YourLog
+```
+ [2020-11-04 16:13:54.593] [INFO] [14][main.go][main] => Hello ION!
+```
+* FixByHand: you can fixByFile or fixByFunc when you found the log line not right
+

example/main.go

@@ -0,0 +1,15 @@
+package main
+
+import (
+	log "github.com/pion/ion-log"
+)
+
+func init() {
+	fixByFile := []string{"asm_amd64.s", "proc.go"}
+	fixByFunc := []string{}
+	log.Init("debug", fixByFile, fixByFunc)
+}
+
+func main() {
+	log.Infof("Hello ION!")
+}

log_test.go

@@ -0,0 +1,29 @@
+package log
+
+import "testing"
+
+func TestLogFormat(t *testing.T) {
+	fixByFile := []string{"asm_amd64.s", "proc.go"}
+	fixByFunc := []string{}
+	Init("debug", fixByFile, fixByFunc)
+	Infof("Hello %s!", "ION")
+}
+
+func TestLogFixByFunc(t *testing.T) {
+	fixByFile := []string{"asm_amd64.s", "proc.go"}
+	fixByFunc := []string{"tRunner"}
+	Init("debug", fixByFile, fixByFunc)
+	Infof("Hello %s!", "ION")
+}
+
+func TestLogFixByFile(t *testing.T) {
+	fixByFile := []string{"asm_amd64.s", "proc.go"}
+	fixByFunc := []string{}
+	Init("debug", fixByFile, fixByFunc)
+	printOK := make(chan struct{})
+	go func() {
+		Infof("Hello %s!", "ION")
+		printOK <- struct{}{}
+	}()
+	<-printOK
+}