docs: added contribution guidelines

Alexander Bilz

11.51.2022 b01a65c902a0f59b865f36411b6de2677cec807a

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{{ define "main" }}
  <div class="page_404">
    <h1>404</h1>
    <h2>{{ i18n "page_not_found" }}</h2>
    <p>{{ i18n "page_does_not_exist" }}</p>
    <p>{{ i18n "head_back" .Site.BaseURL | safeHTML }}</p>
  </div>
 
{{ end }}