Add uart-bridge example

examples/uart-bridge/README.md

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+# A UART to network bridge
+
+This example is a demonstration of how Mongoose Library could be integrated
+into an embedded device and provide a UART-to-Network bridge capability:
+
+- A device opens listening TCP port and Websocket port and waits for connections
+- When a client connects, data is exchanged with the device's UART
+- Everything that client send, is sent to the UART
+- Everything that is read from the UART, gets sent to the client
+- Multiple clients are allowed
+- Live UART console allows to talk to the UART from the web page
+- Web UI is hardcoded into the binary and does not need a filesystem
+
+# Screenshots
+
+![](screenshots/dashboard.png)