Add design patterns information

* Update 100-gof-design-patterns.md

Add resources for design patterns.

* Update content/roadmaps/101-backend/content/114-design-and-development-principles/100-gof-design-patterns.md

* Update content/roadmaps/101-backend/content/114-design-and-development-principles/100-gof-design-patterns.md

Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

content/roadmaps/101-backend/content/114-design-and-development-principles/100-gof-design-patterns.md

@@ -1 +1,12 @@
-# Gof design patterns
+# Design Patterns
+
+Design patterns are typical solutions to commonly occurring problems in software design. They can be broken into three categories: 
+
+- Creational Patterns for the creation of objects
+- Structural Patterns to provide relationship between objects
+- Behavioral Patterns to help define how objects interact
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://github.com/kamranahmedse/design-patterns-for-humans'>Design Patterns for Humans</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://springframework.guru/gang-of-four-design-patterns/'>GOF design patterns</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://refactoring.guru/design-patterns'>Design Patterns</BadgeLink>