init(doc): readme

README.md

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+# Wi-Fi printer
+
+## Usage
+
+Put [`wifi.cls`](./wifi.cls) file along with your `.tex` file.
+
+In your `.tex` file :
+
+```latex
+\documentclass{wifi}
+```
+
+Options available:
+
+|  Option  | Meaning                | default   |
+| :------: | :--------------------- | --------- |
+|  `size`  | Font size              | `45`      |
+| `qrcode` | QR codes height        | `7cm`     |
+| `border` | Border around QR codes | No border |
+
+Commands available:
+
+|          Command          | Meaning                                  |
+| :-----------------------: | :--------------------------------------- |
+|  `\qrc{ssid}{password}`   | Insert a QR code                         |
+| `\insertspaces{password}` | Insert a little space every 4 characters |
+
+## [Exemples](./examples)
+
+See [examples](./examples) of use.