Add favicon

Author: alexeyzimarev

docs/.vuepress/config.js

@@ -2,6 +2,12 @@ module.exports = {
     title: "RestSharp",
     description: "Simple .NET client for HTTP REST APIs",
     plugins: ["@vuepress/active-header-links"],
+    head: [
+        ["link", {rel: "apple-touch-icon", sizes: "180x180", href: "/apple-touch-icon.png"}],
+        ["link", {rel: "icon", type: "image/png", sizes: "32x32", href: "/favicon-32x32.png"}],
+        ["link", {rel: "icon", type: "image/png", sizes: "16x16", href: "/favicon-16x16.png"}],
+        ["link", {rel: "manifest", href: "/site.webmanifest"}]
+    ],
     themeConfig: {
         logo: "/restsharp.png",
         navbar: [

docs/.vuepress/public/android-chrome-192x192.png

@@ -0,0 +1 @@
+{"name":"","short_name":"","icons":[{"src":"/android-chrome-192x192.png","sizes":"192x192","type":"image/png"},{"src":"/android-chrome-512x512.png","sizes":"512x512","type":"image/png"}],"theme_color":"#ffffff","background_color":"#ffffff","display":"standalone"}