Examples: Add readme

Relates to #5

examples/README.md

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+examples
+===
+
+## Go
+This folder contains an example go app that connects using go-libp2p-webrtc-direct. It can be used as follows:
+
+### Install dependencies
+**TODO**: Check the root readme
+
+### Listener
+```sh
+go run main.go -listen
+```
+*Output*
+```
+[listener] Listening
+[listener] Got connection
+[listener] Got stream
+[listener] Received:
+hey, how is it going. I am the dialer
+Failed to accept data channel: The association is closed
+```
+The last line is harmless warning printed by the pions/webrtc library.
+### Dialer
+```sh
+go run main.go
+```
+*Output*
+```
+Warning: Certificate not checked
+[dialer] Opened connection
+[dialer] Opened stream
+Failed to push SCTP packet: Failed sending reply: dtls: conn is closed
+Warning: mux: no endpoint for packet starting with 23
+Failed to push SCTP packet: Failed sending reply: dtls: conn is closed
+Warning: mux: no endpoint for packet starting with 21
+Failed to accept data channel: The association is closed
+```
+The warnings printed by the pions/webrtc library are harmless.
+
+## Javascript
+The equivalent javascript example is also provided. It can be used as follows:
+
+### Install dependencies
+```sh
+npm install
+```
+
+### Listener
+```sh
+node index.js --listen
+```
+*Output*
+```
+[listener] Listening
+[listener] Got connection
+[listener] Got stream
+[listener] Received:
+hey, how is it going. I am the dialer
+```
+### Dialer
+```sh
+node index.js
+```
+*Output*
+```
+[dialer] Opened connection
+[dialer] Opened stream
+```