Define how partners should be ranked

We should document how partners are ranked, since up until now I was the one who assigned the rankings, and they were based on my own subjective criteria from quite a while ago.

My reasoning was that a higher number meant a higher priority:

• Tier 3: Critical infrastructure, or partners that covered multiple categories.
• Tier 2: Partners that provide an important service in a single category (e.g. ESP or Security).
• Tier 1: Partners that support non-critical infrastructure, such as downloads or content.

I don't think these criteria should just be based on my personal opinion, though. They should be documented and agreed upon by the people who oversee the project as a whole.

Es ist keine Datei, kein Test und kein Einstiegspunkt angegeben; beginne damit, die in diesem Issue vorgeschlagenen Kriterien für Tier 1–3 sowie die Diskussion der Projektverantwortlichen zu prüfen. Erledigt ist die Aufgabe, wenn die Ranking-Kriterien vereinbart und in der entsprechenden Projektdokumentation dokumentiert sind.