Commit changes for sys admin guide.

help/system-admin-guide/announcement/README.md

@@ -8,19 +8,19 @@ keywords: announcement
 ---
 # Announcement
 
-Coming soon!
+You can configure **announcements in OpenProject** which will be displayed for a certain period of time for users when the login.
 
-## Overview
+1. Enter a **text** for your announcement message.
+2. **Define a date until when the announcement should be shown**.
+3. **Set the announcement to active**. Only then will the announcement be shown.
+4. **Save** your changes.
 
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+![Sys-admin-announcement](Sys-admin-announcement-1579796618282.png)
 
+The active announcement will be displayed until the defined date to users **on the login screen**.
+
+![Sys-admin-downtime-announcement](Sys-admin-downtime-announcement.png)
+
+Also, the active announcement will be displayed until the defined date to users **on the application start page**.
+
+![Sys-admin-announcement-start-page](Sys-admin-announcement-start-page.png)

help/system-admin-guide/colors/README.md

@@ -8,19 +8,18 @@ keywords: colors
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 # Colors
 
-Coming soon!
+To define a set of colors in OpenProject, navigate to -> *Administration* -> *Colors*. 
 
-## Overview
+You can configure a set of predefined colors in OpenProject which you can choose for e.g. [set colors for work package types](../manage-work-packages/work-package-types/) or attribute highlighting, e.g. for [status](../manage-work-packages/work-package-status/).
 
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+## Define a new color in OpenProject
 
+To add a new color, press the green **+ Color** button at the top right.
+
+![Sys-admin-colors](Sys-admin-colors.png)
+
+1. Add a **name** for your new color.
+2. Enter the **hexcode** for your new color.
+3. Press the blue **Save** button.
+
+![Sys-admin-new-color](Sys-admin-new-color.png)