Add readme file

README.md

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+# Gonfig
+
+[![Go Reference](https://pkg.go.dev/badge/github.com/milad-abbasi/gonfig.svg)](https://pkg.go.dev/github.com/milad-abbasi/gonfig)
+![Build Status](https://github.com/milad-abbasi/gonfig/workflows/Build/badge.svg)
+[![codecov](https://codecov.io/gh/milad-abbasi/gonfig/branch/master/graph/badge.svg?token=jv13V1BgIP)](https://codecov.io/gh/milad-abbasi/gonfig)
+[![Go Report Card](https://goreportcard.com/badge/github.com/milad-abbasi/gonfig)](https://goreportcard.com/report/github.com/milad-abbasi/gonfig)
+[![GitHub release](https://img.shields.io/github/release/milad-abbasi/gonfig.svg)](https://gitHub.com/milad-abbasi/gonfig/releases)
+[![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](https://opensource.org/licenses/MIT)