qa: add code quality checker

.drone.yml

@@ -3,6 +3,15 @@ type: exec
 name: default
 
 steps:
+- name: analyze
+  environment:
+    SONAR_TOKEN:
+      from_secret: sonar_token
+  commands:
+    - /opt/sonar-scanner/bin/sonar-scanner -Dsonar.login=$$SONAR_TOKEN
+   
 - name: deploy
   commands:
   - make deploy
+  depends_on:
+  - analyze

sonar-project.properties

@@ -0,0 +1,8 @@
+sonar.projectKey=telegram-spell-checker
+sonar.projectName=Telegram Spell Checker bot
+sonar.projectVersion=1.0
+
+sonar.sources=propergrammar
+sonar.coverage.exclusions=**/*
+
+sonar.sourceEncoding=UTF-8