Update README.md

Author: eduard93

README.md

@@ -1,2 +1,67 @@
 # Barcode
-Barcode reader
+
+Barcode reader. 
+
+# Use
+
+1. Import `isc.barcode`
+2. Run:
+
+```
+/// Utility methods
+Class isc.barcode.Utils
+{
+
+/// Main class to import
+Parameter CLASS = "isc.barcode";
+
+/// Gateway name to create/use
+Parameter GATEWAY = "Java";
+
+/// Get JGW object
+ClassMethod connect(gatewayName As %String = {..#GATEWAY}, path As %String = "barcode-1.0-SNAPSHOT-jar-with-dependencies.jar", Output sc As %Status) As %Net.Remote.Gateway
+{
+	set gateway = ""
+	set sc = ##class(%Net.Remote.Service).OpenGateway(gatewayName, .gatewayConfig)
+	quit:$$$ISERR(sc) gateway
+	set sc = ##class(%Net.Remote.Service).ConnectGateway(gatewayConfig, .gateway, path, $$$YES)
+	quit gateway
+}
+
+/// Get barcode
+/// Write $System.Status.GetErrorText(##class(isc.barcode.Utils).getBarCode())
+ClassMethod getBarCode(file As %String, debug As %Boolean = {$$$YES}) As %Status
+{
+    #dim gateway as %Net.Remote.Gateway
+    #dim exception as %Exception.AbstractException
+
+    set sc = $$$OK
+    try {
+        set gateway = ..connect()
+        set start = $zh
+        
+        set reader = ##class(isc.barcode).%New(gateway)
+        
+        set end1 = $zh
+        set barcodes = reader.readBarCode(file) 
+		set end2 = $zh
+		
+		if debug {
+			write !,"Init: ",end1-start
+			write !,"Reader: ",end2-end1, !
+			zw barcodes
+	        //break
+		}
+
+        set sc = gateway.%Disconnect()
+
+    } catch ex {
+	    break:debug
+        set sc = $$$ADDSC(ex.AsStatus(), $g(%objlasterror))
+    }
+
+    quit sc
+}
+
+}
+```