Hints for air-quality-sensor in main

Hints

• asv-content-rating-missing
  de.benedikt-wildenhain.air-quality-sensor.metainfo.xml -
  This component has no `content_rating` tag to provide age rating information. You can generate the tag data online by answering a few questions at https://hughsie.github.io/oars/
• asv-cid-contains-hyphen
  de.benedikt-wildenhain.air-quality-sensor.metainfo.xml:4 - de.benedikt-wildenhain.air-quality-sensor
  The component ID contains a hyphen/minus. Using a hyphen is strongly discouraged, to improve interoperability with other tools such as D-Bus. A good option is to replace any hyphens with underscores (`_`).
• asv-summary-first-word-not-capitalized
  de.benedikt-wildenhain.air-quality-sensor.metainfo.xml:9 -
  The summary text does not start with a capitalized word, project name or number.
• asv-description-first-word-not-capitalized
  de.benedikt-wildenhain.air-quality-sensor.metainfo.xml:11 -
  The description line does not start with a capitalized word, project name or number.