docs(example): example bot

packages/provider/src/web-whatsapp/utils.js

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+const { createWriteStream } = require('fs')
+const qr = require('qr-image')
+
+const cleanNumber = (number, full = false) => {
+    number = number.replace('@c.us', '')
+    number = !full ? `${number}@c.us` : `${number}`
+    return number
+}
+
+const generateImage = (base64) => {
+    let qr_svg = qr.image(base64, { type: 'svg', margin: 4 })
+    qr_svg.pipe(createWriteStream(`${process.cwd()}/qr.svg`))
+}
+
+const isValidNumber = (rawNumber) => {
+    const regexGroup = /\@g.us\b/gm
+    const exist = rawNumber.match(regexGroup)
+    return !exist
+}
+
+module.exports = { cleanNumber, generateImage, isValidNumber }