Custom protocol handler for taler:// URI

In order to run the wallet when trying to open an html anchor to a ref starting with "taler://" you have to setup a custom protocol handler in your local setup.



First add this content into file `.config/mimeapps.list` under section `[Default Applications]`

```
x-scheme-handler/taler=taler-wallet-cli.desktop
x-scheme-handler/taler+http=taler-wallet-cli.desktop
```

then create a file named `taler-wallet-cli.desktop` in location `$HOME/.local/share/applications` with content

```
[Desktop Entry]
Name=GNU Taler Wallet CLI URL Handler
GenericName=Wallet
Comment=Handle URL Scheme taler://
Exec=bash -c "taler-wallet-cli handle-uri %u; read"
Terminal=true
Type=Application
MimeType=x-scheme-handler/taler;x-scheme-handler/taler+http
Name[en_US]=GNU Taler Wallet URL Handler
```

Done, you can test it using the next command:

```
$ xdg-open taler://withdraw/bank.demo.taler.net/api/793ee3e4-2915-47e8-9abe-bcc36c8e65cf
```

