updates README

README.md

@@ -1,6 +1,18 @@
-# libp2p Mix Example
+# libp2p Mix Examples
 
-Standalone Nim example for running a libp2p Mix protocol ping simulation.
+Standalone Nim examples for running libp2p Ping over the Mix protocol and for
+demonstrating a switch with multiple transports.
+
+## Examples
+
+This repository contains three runnable examples:
+
+- `mix_ping_tcp.nim` - sends a Ping through a Mix overlay using TCP transport
+  for the mix nodes and destination.
+- `mix_ping_quic.nim` - sends a Ping through a Mix overlay using QUIC transport
+  for the mix nodes and destination.
+- `multiple_transports_example.nim` - creates libp2p switches that support both
+  TCP and QUIC, then runs one Ping preferring QUIC and one Ping preferring TCP.
 
 ## Quick Start
 
@@ -14,12 +26,25 @@ From a fresh clone:
 
 ```bash
 nimble setup -l
-nim c -r mix_ping.nim
+nim c -r mix_ping_tcp.nim
 ```
 
 `nimble setup -l` enables project-local dependency mode, installs dependencies
 under `nimbledeps/`, and generates `nimble.paths` and `nimble.develop`.
 
+Run the individual examples with:
+
+```bash
+nim c -r mix_ping_tcp.nim
+nim c -r mix_ping_quic.nim
+nim c -r multiple_transports_example.nim
+```
+
+The Mix examples start several local libp2p nodes, build a Mix overlay, and send
+a Ping request through that overlay to a destination node. The multi-transport
+example starts separate client switches for the QUIC-preferred and TCP-preferred
+pings so that libp2p connection reuse does not hide which transport was selected.
+
 ## Local Files
 
 The repository uses `config.nims` to keep Nim build output in the local
@@ -31,16 +56,21 @@ These files and directories are local artifacts and should not be committed:
 - `nimble.paths`
 - `nimble.develop`
 - `nimcache/`
-- `mix_ping`
+- `mix_ping_tcp`
+- `mix_ping_quic`
+- `multiple_transports_example`
 
 ## Clean Rebuild
 
 To verify the project can be rebuilt from committed files:
 
 ```bash
-rm -rf nimbledeps nimble.paths nimble.develop nimcache mix_ping
+rm -rf nimbledeps nimble.paths nimble.develop nimcache \
+  mix_ping_tcp mix_ping_quic multiple_transports_example
 nimble setup -l
-nim c -r mix_ping.nim
+nim c -r mix_ping_tcp.nim
+nim c -r mix_ping_quic.nim
+nim c -r multiple_transports_example.nim
 ```
 
 If `nimble setup -l` reports that it cannot determine the VCS revision, make at