Add usage instructions

Author: pchchv

README.md

@@ -1,9 +1,54 @@
 # `json_errors` provides a simple error handling for your REST applications.  [![PkgGoDev](https://pkg.go.dev/badge/github.com/pchchv/json_errors)](https://pkg.go.dev/github.com/pchchv/json_errors) [![Go Report Card](https://goreportcard.com/badge/github.com/pchchv/json_errors)](https://goreportcard.com/report/github.com/pchchv/json_errors)
 
-## Features
+## Features:
 
 * Compatible with built-in `error` interface
 * Error wrapping
 * JSON escaping
 
+#
+
+## Installation:
+
+```bash
+go get github.com/pchchv/json_errors
+```
+
+#
+
+## Usage:
+
+```go
+package main
+
+import (
+	"fmt"
+
+	"github.com/pchchv/json_errors"
+)
+
+func someFunc() error {
+	return json_errors.New("nope")
+}
+
+func main() {
+	if err := someFunc(); err != nil {
+		wrapped := json_errors.Wrap(err, "Message about error")
+		fmt.Println(wrapped.Error())
+	}
+}
+```
+
+```bash
+go run main.go
+```
+
+### Output:
+
+```json
+{"message":"Message about error","details":{"message":"nope"}}
+```
+
+### See [examples](examples) for more.
+
 #