examples/README: Give an overview over the many examples (#2194)

examples/README.md

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+# Examples
+
+A set of examples showcasing how to use rust-libp2p.
+
+## Getting started
+
+- [Ping](ping.rs)
+
+  Small `ping` clone, sending a ping to a peer, expecting a pong as a response. See
+  [tutorial](../src/tutorial.rs) for a step-by-step guide building the example.
+
+## Individual libp2p protocols
+
+- [Chat](./chat.rs)
+
+   A basic chat application demonstrating libp2p and the mDNS and floodsub protocols.
+
+    - [Gossipsub chat](./gossipsub-chat.rs)
+
+      Same as the chat example but using the Gossipsub protocol.
+
+    - [Tokio based chat](./chat-tokio.rs)
+
+      Same as the chat example but using tokio for all asynchronous tasks and I/O.
+
+- [Distributed key-value store](./distributed-key-value-store.rs)
+
+  A basic key value store demonstrating libp2p and the mDNS and Kademlia protocol.
+
+- [IPFS Kademlia](ipfs-kad.rs)
+
+  Demonstrates how to perform Kademlia queries on the IPFS network.
+
+- [IPFS Private](ipfs-private.rs)
+
+  Implementation using the gossipsub, ping and identify protocols to implement the ipfs private
+  swarms feature.
+
+- [Passive Discovery via MDNS](mdns-passive-discovery.rs)
+
+  Discover peers on the same network via the MDNS protocol.
+
+## Integration into a larger application
+
+- [File sharing application](./file-sharing.rs)
+
+  Basic file sharing application with peers either providing or locating and getting files by name.
+
+  While obviously showcasing how to build a basic file sharing application with the Kademlia and
+  Request-Response protocol, the actual goal of this example is **to show how to integrate
+  rust-libp2p into a larger application**.