doc: update readme

Author: tuongaz

README.md

@@ -0,0 +1,46 @@
+# HTTP Server mocking for Go
+
+[![CI](https://github.com/mockingio/go/actions/workflows/main.yml/badge.svg)](https://github.com/mockingio/engine/actions/workflows/main.yml)
+[![codecov](https://codecov.io/gh/mockingio/go/branch/main/graph/badge.svg?token=0AXGI7UR85)](https://codecov.io/gh/mockingio/go)
+[![Go Report Card](https://goreportcard.com/badge/github.com/mockingio/go)](https://goreportcard.com/report/github.com/mockingio/go)
+[![License](https://img.shields.io/badge/License-Apache_2.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
+
+### Go package usage
+
+```go
+import (
+	"net/http"
+	"testing"
+
+	mock "github.com/mockingio/go"
+)
+
+func Test_Example(t *testing.T) {
+	srv := mock.
+		New().
+		Get("/hello").
+		Response(http.StatusOK, "hello world").
+		Start(t)
+	defer srv.Close()
+
+	req, _ := http.NewRequest("GET", srv.URL, nil)
+	client := &http.Client{}
+
+	resp, err := client.Do(req)
+}
+
+func Test_Example_WithRules(t *testing.T) {
+	srv := mock.
+		New().
+		Get("/hello").
+		When("cookie", "name", "equal", "Chocolate").
+		Response(http.StatusOK, "hello world").
+		Start(t)
+	defer srv.Close()
+
+	req, _ := http.NewRequest("GET", srv.URL, nil)
+	client := &http.Client{}
+
+	resp, err := client.Do(req)
+}
+```