add readme for slog integration (#905)

* add readme for slog integration

* partially revert converter

* completely revert convertor

slog/README.MD

@@ -0,0 +1,92 @@
+<p align="center">
+  <a href="https://sentry.io" target="_blank" align="center">
+    <img src="https://sentry-brand.storage.googleapis.com/sentry-logo-black.png" width="280">
+  </a>
+  <br />
+</p>
+
+# Official Sentry Integration for slog
+
+**Go.dev Documentation:** https://pkg.go.dev/github.com/getsentry/sentry-go/sentryslog
+**Example Usage:** https://github.com/getsentry/sentry-go/tree/master/_examples/slog
+
+---
+
+## Installation
+
+```sh
+go get github.com/getsentry/sentry-go/sentryslog
+```
+
+## Usage
+
+```go
+package main
+
+import (
+	"context"
+	"log/slog"
+
+	"github.com/getsentry/sentry-go"
+	"github.com/your-repo/slog-sentry"
+)
+
+func main() {
+	// Initialize Sentry
+	err := sentry.Init(sentry.ClientOptions{
+		Dsn: "your-public-dsn",
+		Debug: true,
+	})
+	if err != nil {
+		panic(err)
+	}
+	defer sentry.Flush(5 * time.Second)
+
+	// Set up slog with Sentry handler
+	handler := slogSentry.Option{
+		Level: slog.LevelError, // Minimum log level
+		AddSource: true,        // Include file/line source info
+	}.NewSentryHandler()
+	logger := slog.New(handler)
+
+	// Example logging
+	logger.Info("This will not be sent to Sentry")
+	logger.Error("An error occurred", "user", "test-user")
+}
+```
+
+## Configuration
+
+The slog-sentry package offers several options to customize how logs are handled and sent to Sentry. These are specified through the Option struct:
+
+- `Level`: Minimum log level to send to Sentry. Defaults to `slog.LevelDebug`.
+
+- `Hub`: Custom Sentry hub to use; defaults to the current Sentry hub if not set.
+
+- `Converter`: Custom function to transform logs into Sentry events (default is DefaultConverter).
+
+- `AttrFromContext`: Functions to extract additional attributes from the context.
+
+- `AddSource`: Include file/line source info in Sentry events. Defaults to `false`.
+
+- `ReplaceAttr`:  Allows modification or filtering of attributes before sending to Sentry.
+
+
+### Example Customization
+
+```go
+handler := slogSentry.Option{
+	Level: slog.LevelWarn,
+	Converter: func(addSource bool, replaceAttr func([]string, slog.Attr) slog.Attr, attrs []slog.Attr, groups []string, record *slog.Record, hub *sentry.Hub) *sentry.Event {
+		// Custom conversion logic
+		return &sentry.Event{
+			Message: record.Message,
+		}
+	},
+	AddSource: true,
+}.NewSentryHandler()
+```
+
+## Notes
+
+- Always call Flush to ensure all events are sent to Sentry before program termination

slog/common.go

@@ -90,7 +90,7 @@ func mergeAttrValues(values ...slog.Value) slog.Value {
 }
 
 func groupValuesByKey(attrs []slog.Attr) map[string][]slog.Value {
-	result := map[string][]slog.Value{}
+	result := make(map[string][]slog.Value)
 
 	for _, item := range attrs {
 		key := item.Key

slog/sentryslog.go

@@ -8,7 +8,6 @@ import (
 )
 
 // Majority of the code in this package is derived from https://github.com/samber/slog-sentry AND https://github.com/samber/slog-common
-// Smaller changes have been implemented to remove dependency on packages that are not available in the standard library of Go 1.18
 // MIT License
 
 // Copyright (c) 2023 Samuel Berthe