docs: add a readme on the examples folder

Author: MegaRedHand

examples/README.md

@@ -0,0 +1,28 @@
+# Examples
+
+This directory has some example networks ready to be loaded into the simulator.
+We also include some information on each example here.
+
+## [HTTP Client-Server](./httpClientServer.json)
+
+This example includes three hosts and two routers, simulating a server and multiple clients that communicate through the internet.
+To see it in action, run the HTTP request program in one of the clients, selecting the HTTP server as the destination.
+
+## [Local network](./localNetwork.json)
+
+This example includes three hosts connected by a single switch, simulating a local area network.
+A good place to check how ARP requests work!
+
+## [Misconfigured router](./misconfiguredRouter.json)
+
+This example includes two hosts connected through a loop of three routers.
+One of the hosts is running the "Echo server" program, which regularly sends ICMP echo packets.
+However, the packets don't ever reach the other host, since one of the router's routing tables is misconfigured.
+The routing table entry for the receiving host instead points to the next router on the loop, causing the packet to be forever lost in the network.
+After a while, the packets are dropped due to their TTL decreasing to zero.
+
+## [Subnetting](./subnetting.json)
+
+This example includes multiple hosts, routers, and switches.
+Each host represents a group of hosts, shown in their tags.
+It was inspired by an exercise on subnet partitioning and routing table configuration.