add design guideline decisions

adr/0017-theme-manager.md

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+# [Design Guideline]
+
+* Status: accepted
+* Deciders: iOS Team
+* Date: 2021-04-14
+
+## Context
+
+We are creating a design guideline. All team members should follow defined rules.
+
+## Decision
+
+* Do not assign 
+
+    - corner radius
+    - shadow
+    - border width/color
+    - text color
+    - background color
+    - text size
+    - tint color
+
+on storyboard.
+
+* Do not use any color that isn't in our color palette. If that is the case contact with designer team.
+* Add icons as SVGs. Choose single scale while adding.
+
+## Consequences
+
+Project will be ready to implement design guideline.