add systemd service configuration

contrib/README.md

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+# Create systemd service
+
+Copy zbot service definition.
+```
+sudo cp zbot.service /etc/systemd/system/zbot.service
+sudo cp zbot.default /etc/default/zbot
+sudo chmod 664 /etc/systemd/system/zbot.service
+```
+
+Enable and start zbot service
+
+```
+sudo systemctl daemon-reload
+sudo systemctl enable zbot
+sudo systemctl start zbot
+sudo systemctl status zbot
+```
+
+Create symlink
+
+````
+sudo ln -s /path/to//zbot-telegram-go-linux-amd64 /usr/local/bin/zbot
+```

contrib/zbot.default

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+#!/bin/bash
+
+#ZBOT configuration
+
+ZBOT_TOKEN=""
+ZBOT_LOG_LEVEL=debug
+ZBOT_DATABASE_TYPE=sqlite
+ZBOT_MODULES_PATH="/home/zbot/modules"
+ZBOT_DISABLED_COMMANDS="/home/zbot/disabled_commands.json"
+ZBOT_SQLITE_DATABASE="/home/zbot/db/database.db"

contrib/zbot.service

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+[Unit]
+Description=Zbot as a Service
+
+[Service]
+EnvironmentFile=/etc/default/zbot
+ExecStart=/usr/local/bin/zbot
+ExecStop=kill $(ps aux | grep '/usr/local/bin/zbot' | grep -v grep | awk '{print $2}')
+User=zbot
+Group=zbot
+
+[Install]
+WantedBy=multi-user.target