Added readme

README.md

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+# closer : 🚪 provides a clean exit mechanism for your Go application.
+
+We shouldn't hard-break connections to various parts of our application. 
+When stopping an application, it is important to smoothly close connections to active connections, 
+be it a database or something else. 
+Because you may encounter troubles in the form of data loss and corruption.
+
+This small package was written to solve this problem.
+
+## Installation
+
+```bash
+go get github.com/eliofery/closer
+```
+
+## Usage
+
+```go
+func main() {
+    // Create new instance of Closer.
+    clr := closer.New()
+
+    // Success close something.
+    clr.Add(func() error {
+        fmt.Print("Hang on! I'm closing some DBs, wiping some trails..")
+        time.Sleep(3 * time.Second)
+        fmt.Println("  Done.")
+
+        return nil
+    })
+
+    // Error close something.
+    clr.Add(func() error {
+        return errors.New("error close something")
+    })
+
+    // Waiting for the application to exit, for example when pressing Ctrl+C in the terminal.
+    clr.Wait()
+
+    // After closing, wait for all functions to close.
+    if err := clr.Close(); err != nil {
+        log.Printf("\n%v", err)
+    }
+}
+```
+
+## Inspiration
+
+I was inspired to write this package by the [xlab](https://github.com/xlab/closer).