update readme and add travis.yml

.gitignore

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+.vscode
+.DS_Store
\ No newline at end of file

.travis.yml

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+language: go
+
+sudo: false
+
+env:
+  - GO111MODULE=on
+
+before_install:
+  - go get github.com/casbin/casbin
+
+go:
+  - "1.14"
+
+script:
+  - go test
\ No newline at end of file

README

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-Casbin.js Server Utilities for Casbin
-
-If you are using Casbin.js at your frontend and [Go Casbin](https://github.com/casbin/casbin)as your backend Casbin service, you can install this package at your backend. This package provides a wrapper for generating the user permission, which can be passed to Casbin.js at the frontend.
-
-### Installation
-```
-go get github.com/casbin-js/go-utils/v2
-```
-
-

README.md

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+# Casbin.js Server Utilities for Casbin
+
+If you are using Casbin.js at your frontend and [Go Casbin](https://github.com/casbin/casbin)as your backend Casbin service, you can install this package at your backend. This package provides a wrapper for generating the user permission, which can be passed to Casbin.js at the frontend.
+
+### Installation
+```
+go get github.com/casbin-js/go-utils/v2
+```
+
+### Example
+```go
+package main
+
+import (
+    "fmt"
+
+    casbinjs "github.com/casbin-js/go-utils"
+    "github.com/casbin/casbin"
+)
+
+func main() {
+    e, err := casbin.NewEnforcer("path/to/model.conf", "path/to/policy.csv")
+    if err != nil {
+        panic(err)
+    }
+    s, _ := casbinjs.GetPermissionForUser(e, "alice")
+    // Now `s` has the info of alice's permission
+    // Pass the permission data to your frontend application.
+}
+```
+
+
+