Create README.md

Author: tonyvugithub

README.md

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+# HttpStatusCodeAPI
+Description: A simple API endpoint for response http status codes 
+
+## How to use?
+1. Clones repo and run 
+   ```go
+      go run main.go
+   ```
+   If you don't have GO, go [here](https://golang.org/) for instructions of installation<br/>
+   Access the endpoint at ***localhost:8080/status/[code number]***<br/>
+   Eg: localhost:8080/status/404 <br/>
+   => This will return a document with **404** status<br/>
+2. Opens executable file by double-clicking a file inside **executables** folder that is compatible with your system. 
+3. Accesses API through already hosted link, please follow the format below:<br/>
+   **https://arcane-basin-93470.herokuapp.com/status/[_code number_]**<br/>
+   Eg: https://arcane-basin-93470.herokuapp.com/status/200 <br/>
+   => This will return a document with **200** status<br/>
+
+Note: This API has all the status codes that you can get back from GET request, 2xx - 5xx