Updated struct.

CONTRIBUTING.md

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+# Contributing
+
+Here provided more info about project, contribution process and recomended changes.
+Please, read it before pull request or create issue.
+
+## Codestyle 
+
+### Marks
+
+For clean struct code good is using marks. 
+
+```swift
+class Example {
+
+    // MARK: - Init
+    
+    init() {}
+}
+```
+
+Here you find all which using in project:
+
+- // MARK: - Init
+- // MARK: - Lifecycle
+- // MARK: - Layout
+- // MARK: - Helpers
+
+If you can't find valid, add new to codestyle agreements please. Other can be use if class is large and need struct it even without adding to codestyle agreements.