Update CODING_STANDARDS.md

Expand with more points

Author: jelbourn

CODING_STANDARDS.md

@@ -172,6 +172,8 @@ API docs.
 * Always use a `readonly` property instead of a getter (with no setter) when possible.
 * Avoid long getters and setters. If the logic of an accessor would take more than three lines,
 introduce a new method to contain the logic.
+* A getter should also immediately precede its corresponding setter.
+* Decorators such as `@Input` should be applied to the getter and not the setter.
 
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