add demo app

stbf-demo/src/main/java/ru/penkrat/stbf/demo/App.java

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+package ru.penkrat.stbf.demo;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import picocli.CommandLine;
+import ru.penkrat.stbf.api.BotCommandChain;
+import ru.penkrat.stbf.api.CommandChain;
+import ru.penkrat.stbf.impl.pengrad.PengradTelegramBot;
+import ru.penkrat.stbf.templates.xml.XmlFlowResolver;
+
+import java.util.concurrent.atomic.AtomicReference;
+
+@CommandLine.Command(name = "java -jar stbf-demo.jar", mixinStandardHelpOptions = true, description = "Run bot",
+        version = "Simple Telegram bot framework Demo app v. 0.0.1")
+public class App implements Runnable {
+
+    private static final Logger log = LoggerFactory.getLogger(App.class);
+
+    private static AtomicReference<PengradTelegramBot> botAtomicReference = new AtomicReference<>();
+
+    @CommandLine.Option(names = {"-f", "--file"}, description = "The file with config.")
+    private String flowFile = "classpath:/flow.xml";
+
+    @CommandLine.Option(names = {"-t", "--token"}, required = true, description = "bot token 1234:abscdf...")
+    private String botToken = "";
+
+    public static void main(String[] args) {
+        new CommandLine(new App()).execute(args);
+    }
+
+    private BotCommandChain getCommandChain(String filename) {
+        XmlFlowResolver flow = new XmlFlowResolver(filename);
+
+        BotCommandChain chain = new BotCommandChain();
+        flow.getCommands().forEach(chain::add);
+
+        return chain;
+    }
+
+    private Runnable start(String token, CommandChain chain) {
+        return () -> botAtomicReference.set(new PengradTelegramBot(token, chain));
+    }
+
+    private void onShutdown() {
+        try {
+            if (botAtomicReference.get() != null) {
+                botAtomicReference.get().close();
+                log.info("Bot finished.");
+            }
+        } catch (Exception e) {
+            log.error("Error:", e);
+        }
+    }
+
+    @Override
+    public void run() {
+        Thread botThread = new Thread(start(botToken, getCommandChain(flowFile)));
+        botThread.setDaemon(false);
+        botThread.setName("stbf-bot-thread");
+
+        Runtime.getRuntime().addShutdownHook(new Thread(this::onShutdown));
+
+        log.info("Starting bot...");
+        botThread.start();
+        log.info("Bot started.");
+        log.info("Press Ctrl+C to exit.");
+    }
+}

stbf-demo/src/main/resources/flow.xml

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+<flow>
+    <actions>
+        <action id="10001" name="start-action" command="/start">Start</action>
+        <action id="10002" name="help-action" command="/help">Help</action>
+    </actions>
+    <screens>
+        <screen id="20001" name="on-start-screen">
+            <text>This is demo bot</text>
+            <keyboard>
+                <row>
+                    <button actionRef="help-action">Action.name</button>
+                </row>
+            </keyboard>
+        </screen>
+        <screen id="20001" name="on-help-screen">
+            <text>This is demo help</text>
+            <keyboard>
+                <row>
+                    <button actionRef="help-action">Action.name</button>
+                </row>
+            </keyboard>
+        </screen>
+    </screens>
+    <commands>
+        <command actionRef="start-action" screenRef="on-start-screen" id="30001" name="startCommand"/>
+        <command actionRef="help-action" screenRef="on-help-screen" id="30002" name="helpCommand"/>
+    </commands>
+</flow>

stbf-demo/src/main/resources/logback.xml

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+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="debug">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>