Added travis sanity check

.travis.yml

@@ -0,0 +1,14 @@
+language: python
+dist: jammy
+
+python:
+  - "3.9"
+
+before_install: cd assistant
+
+install:
+  - pip install -r requirements.txt
+  - pip install flake8
+
+script:
+  - make check

README.md

@@ -5,7 +5,7 @@ _Language versions:_\
 [![FR](https://github.com/pskowronek/home-air-quality-and-assistant/raw/master/www/flags/lang-FR.png)](https://translate.googleusercontent.com/translate_c?sl=en&tl=fr&u=https://github.com/pskowronek/home-air-quality-and-assistant)
 [![ES](https://github.com/pskowronek/home-air-quality-and-assistant/raw/master/www/flags/lang-ES.png)](https://translate.googleusercontent.com/translate_c?sl=en&tl=es&u=https://github.com/pskowronek/home-air-quality-and-assistant)
 
-# Home Air Quality plus Voice Assistant
+# Home Air Quality plus Voice Assistant [![Build Status](https://travis-ci.com/pskowronek/home-air-quality-and-assistant.svg?branch=master)](https://app.travis-ci.com/github/pskowronek/home-air-quality-and-assistant)
 
 This project is a result of Covid-19 lockdown :) Some references you can find on top of the final assembly (like the police hunting people going outside :>).
 Basically, the project is to display in-door air quality metrics plus to give you a possibility to interact with the device using voice, akin to Alexa or Google Home - but offline :)