Update README.md

Author: jmathtech

README.md

@@ -1,6 +1,11 @@
 # User-Credential-Form-PHP
 A user credential form for 'customers' and business vendors; written scripts are in PHP.
 
+#### Server request to determine if the request is POST or GET
+```php
+if ($_SERVER["REQUEST_METHOD"] == "POST") 
+
+```
 
 # Example Screenshots
 ![image](https://user-images.githubusercontent.com/36749450/95667495-f7e33680-0b34-11eb-9a0e-95e208365784.png)