add changelog and update readme

CHANGELOG.md

@@ -0,0 +1,8 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## 1.0.0
+### Added
+- Gormlog library
+- Example in readme

README.md

@@ -1,2 +1,30 @@
 # gormv2-logrus
 Easily connect Gorm V2 and logrus with customizable options
+
+Usage example : 
+
+```go
+package test
+
+import (
+	gormv2logrus "github.com/thomas-tacquet/gormv2-logrus"
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
+)
+
+func myFunctionToConnectOnMyDB(e *logrus.Entry) {
+	gormLogger := gormv2logrus.NewGormlog(gormv2logrus.WithLogrusEntry(e))
+	gormLogger.LogMode(logger.Error)
+
+	gormConfig := &gorm.Config{
+		Logger:                 gormLogger,
+		CreateBatchSize:        1500,
+		SkipDefaultTransaction: true,
+	}
+
+	db, err := gorm.Open(
+		"CONNEXION STRING",
+		gormConfig,
+	)
+}
+```