Add README.md

Add windows support

print.js

@@ -0,0 +1,23 @@
+import { platform } from 'os';
+import * as windowsMethods from 'pdf-to-printer';
+import * as linuxMethods from 'unix-print';
+
+let methods;
+
+if (platform() === 'win32') {
+    methods = windowsMethods.default;
+} else {
+    methods = linuxMethods.default;
+}
+
+export const print = async (file, printer) => {
+    if (platform() === 'win32') {
+        return await methods.print(file, {printer});
+    }
+
+    return await methods.print(file, printer);
+}
+
+export const getPrinters = async () => {
+    return await methods.getPrinters();
+}