Add README.md

Add windows support

README.md

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+# Print Utils
+
+## Description
+
+This is a [Sendcloud](https://www.sendcloud.com) compatible Print Client which runs on Windows, Linux and Mac. Its goal
+is providing a simple and easy to use interface to print documents from any application to a printer connected to the
+computer.
+
+## Installation
+
+To be done.
+
+## Usage
+
+### List Printers
+
+#### Request:
+
+```bash
+curl --location 'http://127.0.0.1:1903/printers'
+```
+
+#### Response:
+
+> The `default` property is currently always `false` because the default printer is not yet supported.
+
+```json
+[
+  {
+    "default": false,
+    "format": "PDF",
+    "id": "PM-241-BT (Network)",
+    "name": "PM-241-BT (Network)"
+  }
+]
+```
+
+### Print a PDF
+
+#### Request:
+
+```bash
+curl --location 'http://127.0.0.1:1903/printers/PM-241-BT%20(Network)/print' \
+--form 'file=@"label.pdf"' \
+--form 'copies="1"'
+```
+
+#### Response:
+
+> On windows the response does not return any real job id. Instead, it returns a 0.
+
+```json
+{
+  "jobs": [
+    "1"
+  ]
+}
+```