chore: added example usages in readme.md

Author: izniburak

readme.md

@@ -15,7 +15,45 @@ go get github.com/izniburak/pipeline-go
 ```
 
 ## Examples
+```go
+package main
 
+import (
+	"fmt"
+	"strings"
+	"github.com/izniburak/pipeline-go"
+)
+
+type UpperCasePipe struct{}
+
+func (u *UpperCasePipe) Handle(value pipeline.PipeValue, next pipeline.PipeNext) pipeline.PipeValue {
+	// get value
+	text := value.(string)
+	capitalized := strings.ToUpper(text)
+	return next(capitalized)
+}
+
+type TrimSpacePipe struct{}
+
+func (t *TrimSpacePipe) Handle(value pipeline.PipeValue, next pipeline.PipeNext) pipeline.PipeValue {
+	// get value
+	text := value.(string)
+	trimmed := strings.Trim(text, " ")
+	return next(trimmed)
+}
+
+func main() {
+	text := "   buki.dev   "
+
+	pipes := []pipeline.PipeInterface{
+		new(UpperCasePipe),
+		new(TrimSpacePipe),
+	}
+	result := pipeline.Send(text).Through(pipes).ThenReturn()
+
+	fmt.Println(result) // BUKI.DEV
+}
+```
 
 ## Contributing