Write some info in README.md, design titlebar, make downloader and very basic instance checker

lib/util/functions.js

@@ -0,0 +1,7 @@
+module.exports = {
+	"sleep": function (delay) {
+		return new Promise(function (resolve, reject) {
+			setTimeout(resolve, delay);
+		});
+	}
+};

lib/util/https.js

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+const https = require("https");
+
+module.exports = {
+	"get": function (url) {
+		return new Promise(function (resolve, reject) {
+			var request = https.get(url, function (response) {
+				if (response.statusCode != 200) return reject(new Error("Response status code wasn't 200. "));
+
+				response.setEncoding("utf-8");
+				let body = "";
+
+				response.on("data", function (chunk) {
+					body += chunk;
+				});
+
+				response.on("end", function () {
+					resolve(body);
+				});
+			});
+
+			request.on("error", reject);
+		});
+	},
+	"getStream": function (url) {
+		return new Promise(function (resolve, reject) {
+			var request = https.get(url, function (response) {
+				if (response.statusCode != 200) return reject(new Error("Response status code wasn't 200"));
+
+				resolve(response);
+			});
+
+			request.on("error", reject);
+		});
+	}
+};