Created The getURI function (markdown)

The-getURI-function.md

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+The `getURI` function returns the base URI for a bridge.
+
+**Notice:** By default **RSS-Bridge** returns `const URI`, so you only have to implement this function if you require different behavior!
+
+```PHP
+	public function getURI(){
+		return self::URI;
+	}
+```