Add OSI / TCP IP model content (#1891)

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

content/roadmaps/114-software-architect/content/114-networks/100-osi-tcp-ip-model.md

@@ -1,4 +1,8 @@
-# Osi tcp ip model
+# OSI and TCP/IP Models
 
-TCP/IP Model is a communication protocols suite using which network devices can be connected to the Internet. 
-On the other hand, the OSI Model is a conceptual framework, using which the functioning of a network can be described.
+The OSI and TCP/IP model is used to help the developer to design their system for interoperability. The OSI model has 7 layers while the TCP/IP model has a more summarized form of the OSI model only consisting 4 layers. This is important if you're are trying to design a system to communicate with other systems.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.cloudflare.com/learning/ddos/glossary/open-systems-interconnection-model-osi/'>Cloudflare - What is the OSI model</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.geeksforgeeks.org/layers-of-osi-model/'>Geeksforgeeks - Layers of OSI model</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.geeksforgeeks.org/tcp-ip-model/'>Geeksforgeeks - TCP/IP model</BadgeLink>